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1Published 1953“...Sudan Survey Department for Geological Survey,...”
Map -
2Published 1975“...Geological Survey,...”
Government Document Map -
3
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4
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5Published 1975“...U.S. Geological Survey,...”
Government Document Map -
6
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7by Hair, P. E. H. (Paul Edward Hedley)“...Cambridge U.P. in association with the West African Languages Survey and the Institute of African...”
Published 1967
Book