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Natural vegetation : Grassland and desert shrub ; forests
Shantz, Homer L., (1924)
Forestry policy in Nigeria 1897 - 1960
Egboh, Edmund Onyemeke, (1985)
100 [Hundred] years of forestry development in Nigeria
Okoro, O. O., (1989)
An Outline of Nigerian vegetation
Keay, R. W. J., (1953)