BOOKS:
1. Udo, R. K (1970) Geographical Regions of Nigeria. Heinemann. London and University of
California Press, 232 pages.
2. Udo, R. K. (1975) Examination Guidelines for School Certificate Geography. Heinemann,
Ibadan pp. 51.
3. Udo, R. K (1975) Migrant Tenant Farmers of Nigeria. African Universities Press, Lagos, 154
pages.
4. Udo, R. K (1978) A Comprehensive Geography of West Africa. Heinemann, Ibadan and
London; and African Publishing Corporation, New York, 304 pages.
5. Udo, R. K. et al (1979) Population Education Source Book for Sub-Saharan Africa.
Heinemann, Nairobi.
6. Udo, R. K (1981) The Human Geography of Tropical Africa. Heinemann, London, 240 pages.
7. Udo, R. K (1990) Land Use Policy and Land Ownership in Nigeria. Ebie Akwa Ventures,
Lagos, 167 pages.
8. Udo, R. K and Mamman, A. B. (1993) Nigeria: Giant in the Sun. Vol. 2. State Surveys.
Gabumo Press. Lagos.
MONOGRAPHS
10. Udo, R. K (1980) Implementation of the Land Use Decree Lessons from the Japanese Experience. Institute of Developing Economics, Tokyo.
11. Udo, R. K (1981) Land Policy for Effective Implementation of the National Economy. Ibadan University Press (Inaugural lecture Series).
12. Udo, R. K (1982) Food Production and Agricultural Development Strategies in Nigeria. Institute of Developing Economies. Joint Research Programme Series, Tokyo. pp.120
13. Udo, R. K. 1998 The National Land Policy of Nigeria ; An Appraisal of the Land Use Decree, 1978. Research Report, No.16. Development Policy Center. Ibadan. Nigeria.
pp. 101.
14 Udo, R. K. (2000) Population Census in Nigeria: DEPOLITICIZATION Ebie Akwa Ventures, Lagos.
ARTICLES.
15. Udo, R. K (1960) Land and Population in Otoro District Niger
16. Udo, R. K (1963) Patterns of Population Distribution and Settlement in Eastern Nigeria, Nigerian Geographical Journal Pages 73-88.
17 Udo, R. K (1965) The Migrant Tenant Farmer of Eastern Nigeria, Africa (Journal of the International African Institute) London. Vol. 34, Pages 326 - 339.
18. Udo, R. K. (1965) Disintegration of Nucleated Settlement in Eastern Nigeria, Geographical Review. New York. Vol. 60, Pages 53 - 67.
19. Udo, R. K. (1965) Problems of Developing the Cross River District of Eastern Nigeria, Journal of Tropical Geography. Kuala Lumpur Vol. 20, pages 65 - 72.
20. Udo, R. K. (1965) Sixty Years of Plantation Agriculture in Southern Nigeria, Economic Geography, Clark University, Ithaca, Mass. Vol. 41, pages 356 - 368.
21. Udo, R. K. and Ogundana, B. (1966) Factors Influencing the Fortunes of Ports in the Niger Delta. Scottish Geographical Magazine. 82, Pages 169 - 183.
22. Udo, R. K. (1966) Transformation of Rural Settlements in British Africa, Nigerian Geographical Journal, pp. 129 - 144.
23. Udo, R. K. (1967) British Policy and the Development of Export Crops in Nigeria, The Nigerian Journal of Economic and Social Studies, 9, 299 - 314.
24. Udo, R. K. (1967) The Growth and Decline of Calabar, Nigerian Geographical Journal, 10, pages 91 - 106.
25. Udo, R. K. (1968) Aspects of the Geography of the Western Sudan at the time of Henry Barth's Travels (1850-1854), Journal of Tropical Geography Kuala Lumpur 26, Pages 82 - 92.
26 Udo, R. K. (1968) Population and Politics in Nigeria in Caldwell, J. C. and Okonjo, C. (Eds.), The Population of Tropical Africa, Longmans, Pages 97 - 105.
27. Udo, R. K. (1968) Nigeria Land and Economy - Collier's Encyclopedia, New York, Pages 538 -545.
28. Udo, R. K. (1969) The Changing Economy of the Lower Niger Valley, Nigerian Geographical Journal 12, Pages 113 - 124.
29. Udo, R. K. (1970) Rural - Rural Migrations in Nigeria, Nigeria magazine, 103, Pages 616 - 624.
30. Udo, R. K. (1970) Census Migrations in Nigeria, Nigerian Geographical Journal, 13, Pages 3 - 7.
31 Udo, R. K. (1970) Reconstruction in the War Affected Areas of Nigeria, Area (Published by the Institute of British Geographers), No. 3, Pages 9 - 12.
32. Udo, R. K (1971) Food Deficit Areas of Nigeria. Geographical l Review, New York. Vol. 61, Pages 415 - 430.
33. Udo, R. K (1971) Characteristics of Migrant Tenant Farmers of Nigeria, Nigerian Geographical Journal, 14, pp. 121 - 139.
34. Udo, R. K. (1971) Examination Guidelines for Students and Teachers in Geography in Majasan, J. A. (Ed.) New Dimensions in Nigerian High School Geography, Ibadan, Pages 185 - 196.
35. Udo, R. K. (1972) Implications of the Pattern of Internal Migrations for Rural Planning in Nigeria - in Barbour, K. M. (ed.), Planning for Nigeria, Pages 87 - 99.
36. Udo, R. K. (1972) Land Policy, Farm Migrations and Rural Planning in Nigeria, Proceedings: 22nd International Geographical Congress, Montreal, Canada, Pages 771 - 773.
37. Udo, R. K. (1972) Influence of Migrations on the Changing Cultural Map of West Africa, Ikenga, Journal of African Studies, Nsukka, Pages 48 - 55.
38. Udo, R. K. (1975) Migration and Urbanization in Nigeria in Caldwell, J. C. (ed.), Population and Socio-Economic Change in West Africa, Columbia, Pages 225 - 232.
39. Udo, R. K. (1974) Rural Migrations and the Problems of Agricultural Labour in Western Tropical Africa in Hoyles, B. S. (ed.), Spatial Aspects of Development, John Wiley, London, pages 189 - 207.
40. Udo, R. K. (1974) Nigeria, the Encyclopedia Britannica, Chicago, Vol. 16, Pages 85 - 96.
41. Udo, R. K. (1975) Agricultural Land Use in South-Eastern Nigeria in C. Vanzetti (ed.) World Atlas of Agriculture, Rome, Pages 429 - 438.
42. Udo, R. K. (1976) Applied population geography, A survey of International Geography Union, Edmonton, 20 Pages.
43. Udo, R. K. (1976) Migration and the Rural Economy of Southwestern Nigeria in A. Adepoju, Internal Migration in Nigeria, University of Ife, Ile-Ife. Conference Proceedings, Pages 140 - 147.
44 Udo, R. K. (1976) Migration and Rural Change in Sub-Saharan Africa in Knight C. G. and Newman, J. L. (Eds.) Contemporary Africa, Prentice-Hall, Pages 266 - 278.
45. Udo, R. K. (1978) Internal Migrations and Development in J. S. Oguntoyinbo, Et Al (Eds.), A Geography on Nigerian Development, Heinemann, Ibadan, Pages 124 - 137
46. Udo, R. K. (1979) Size, Distribution and Structure of Population in Africa, South of the Sahara. Population Education Source Book for Sub-Sahara Africa. Heinemann Educational Books. Nairobi. pp. 62 - 74.
47. Udo, R. K. (1979) Population and Politics in Africa South of the Sahara. Population Education source Book for Sub-Saharan Africa. Heinemann Educational Books. Nairobi. pp. 172-181.
48. Udo, R. K. (1979) Implications of the Drift of Population to the Southwest of Nigeria, Nigerian Geographical journal, Vol. 22, No. 1, pp. 3 - 15.
49. Udo, R. K. (1979) Migration and Ecological change in Nigerian Forest Zone in Okali D. U. U. (Ed) The Nigerian Rain Forest Ecosystem, Ibadan, Pp. 301 - 6.
50. Udo, R.K. (1980). Environments and Peoples of Nigeria; A Geographical Introduction to
the History of Nigeria, in O. Ikime (Ed.) Groundwork of Nigerian History Heinemann, Ibadan. Pp. 7-24.
51. Udo, R. K. (1981) Implications of the Lands Use Decree, 1978 for Rural Development in Nigeria in Ishadi, H; Hill, R. D.; et al (Eds). Changing Agriculture and Rural Development The World and Japan. Papers and Proceedings of the IGU Symposium,
Nagano, Japan, Pp.74 - 78.
52. Udo, R. K. (1981) The 1983 Population Census of Nigeria; Ideals and Realities. Nigeria Geographical Journal, Vol.24 Pp. 175 - 85.
53. Udo, R. K. (1985) An Assessment of Recent Government Effort to Increase Food Production in Nigeria. Rural Systems. An International Quarterly Journal, Vol.?
54. Udo, R. K. (1985) Population, Land Resources and Rural Development in Nigeria in Akinbobe, I. A. (Ed.) Population and Rural Development in Nigeria. University of Ife, Ile- Ife.
54. Udo, R. K. (1985) Population Policies and Politics (National and International). Nigerian Educational Research and Development Council Programme on Population Education.
Monograph, No. 12, Lagos, Pp. 1.
56. Udo, R. K. (1985) Land Acquisition and Allocation Constraints on Development Before and After the Land Use Decree 1978 in G. O. Alaore (Ed.) Land Use and National Development in Nigeria NISER Report. Ibadan, Pp. 31 - 129.
57. Udo, R. K. (1988) Population Census and Vital Registration (A Module in Population Education for Schools) Nigerian Educational Research and Development Council, Lagos.
58. Udo, R. K., Areola, O. O., Ayoade, J. O. and Afolayan, A. A. (1990) - Nigeria: Regional Study of Transformation in B. L. Turner II Et Al (Eds,) The Earth As Transformed by Human Action. Cambridge University Press. Pp. 589 - 603.
59. Udo, R. K. (1991) - Environment for Sustainable Development in Mabogunje, A. L. and Obasanjo, O. (Ed.) Nigeria 2010 AD and Beyond: The Changes of the Youth Africa Leader Forum Publications. Pp. 125 - 140.
60.. Udo, R. K. (1992) The Land Use Decree and the Antecedents Ibadan University Lectures 1985, Ebie Akwa Ventures, Ikot - Ekpene.
61 Udo, R. K. (1993) Land use and Environmental change in the Lake Chad Basin of Nigeria. Berichte des Sonderforschungsbereichs 268, Bd. 2 Frankfurt pp. 255-68.
62. Udo, R. K. (1993) The Population of Nigeria in Adalemo, I. A. and Baba J. M. (Eds) Nigeria: Giant in the Tropics Vol.1 A Compendium. Gabumo Publishers Lagos Pp. 29- 33.
63. Udo, R. K. (1993) Akwa Ibom State in Udo, R. K. and A. B. Mamman (Eds) Nigeria: Giant in the Tropics Vol.2 State Surveys. Gabumo Publishers, Lagos. Pp. 51 - 63.
64. Udo, R. K. (1994) Population Policy and National Development in Udo, R. K. et al (ed). Population and Development in Nigeria. Fed. Govt Press. Lagos Pp 9 - 12
65. Udo R. K. (1994) The Impact of Population Pressure on the Environment Migration and
Labour in Udo, R. K. et al (Eds) Population and Development in Nigeria Fed. Govt
Press. Lagos Pp. 79 - 90.
66. Udo, R. K. (1996) Population Growth and the Future of Urbanization in Nigeria. 1996 World Population Day Lecture. Department of Community Development and
Population Activities, Federal Ministry of Health. Lagos. pp. 28.
67. Udo, R. K . (1997) Migration and Urbanization in Nigeria, in Nigeria Migration and
Urbanization Survey 1993. NISER, Ibadan. pp. 9-18.
68. Udo, R. K. et al (1998) Population Size and Spatial Distribution in 1991 Population Census of the Federal Republic of Nigeria - Analytical Report at the National Level. National Population Commission. pp 25-37.
69. Udo, R. K. et al (1998) Urbanization in 1991 Population Census of the Federal Republic of Nigeria – Analytical Report at the National Level. National Population Commission. pp 299-317.
70. Udo, R. K. (1998) Geography, Geographers and Population Censuses in Nigeria in Areola, O and Okafor, S. (1998) eds. Fifty Years of Geography in Nigeria: The Ibadan Story. press. Ibadan University Press pp. 348-72.
71. Udo, R. K. (1999) Population and the Environment, in J. O. Abiodun, Filani, M. O., Sridhar, M. C. K., Olomola, A. O.(1999), eds. Nigeria's Endangered Environment: Agenda for a New Millennium The Seventh Awo Foundation Dialogue. Lagos.
72. Udo, R.K. (2002) Environmental Challenge and Transport Development in the Niger Delta,
in E.J.Allagoa (2002) (ed.).
73. Udo, R. K. Udo (2002) The 1991 Population Csensus of Nigeria: A Comparative Study, in
Omuta, Gideon E. D. and Isi A. Ikhuoria (2002) (eds), Geography and Sustainable
Development in Nigeria. The Nigerian Geographical Association. Ibadan. Pp 235-270.
74. Udo, R. K. (2003) The Demographic Components of Labour Statistics and Policy Issues, in
Ukpong, Ebebe A. (ed.) Manpower Data and Labour Market Analysis in Nigeria. National
Manpower Board. Abuja. Pp. 260-282.
75. Udo, R.K, (2004) African Geography: The Past, Present and Future in African Geography:
The Case of Nigeria. African Geographical Review New York Vol. 23. Pp. 83-99.
76. Udo, R. K (2012) Population Pressure and the Nigeria Environment, in Matt. F.A. Ivbijaro
and Festus Akintola (2006), (eds,) Sustainable Environmental Management in Nigeria.
Second Edition, Book Buiders. Edition Africa, Ibadan. Ibadan. Pp. 73-102.
77. Udo, R.K, (2013) The Niger Delta and Regional Development, in Akande, S. O and Kumuyi, F. (eds.) Nigeria at 50: Accomplishments, Challenges and Prospects. Nigerian Institute for Social and Economic Development (NISER) Ibadan. Pp……