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Author
- Nigeria. Survey Department33
- Map and Geospatial Information Center, Lewis Library, Princeton University26
- Great Britain. Colonial Office6
- Proxy Logic Ltd.6
- Kontex Geomatics4
- Famine Early Warning System Network3
- Hijmans, Robert J.3
- United States. Agency for International Development3
- University of California, Berkeley. Museum of Vertebrate Zoology3
- Map Maker Ltd.2
- Nigeria. Lands and Surveys Department2
- Arrowsmith, John, 1790-18731
- ESRI1
- GfK GeoMarketing GmbH 1
- Global Resource Information Database1
- International Association of Seismology and Physics of the Earth's Interior1
- International Heat Flow Commission1
- John Bartholomew and Son.1
- Macmillan Nigeria Publishers.1
- Nigeria. Survey Department, compiler, cartographer, issuing body.1