The Niger Delta petroleum system [microform] : Niger Delta province, Nigeria, Cameroon, and equatorial Guinea, Africa / by Michele L.W. Tuttle, Ronald R. Charpentier, and Michael E. Brownfield (Open-file report ; 99-50-H)
The Niger Delta petroleum system [microform] : Niger Delta province, Nigeria, Cameroon, and equatorial Guinea, Africa / by Michele L.W. Tuttle, Ronald R. Charpentier, and Michael E. Brownfield