@misc{indiciae2a60c0b845cc,
  title = {Maps showing geology, oil and gas fields and geological provinces of Africa},
  author = {F.M. Persits and Thomas S. Ahlbrandt and Michele L. Tuttle and Ronald R. Charpentier and Michael E. Brownfield and Kenneth I. Takahashi},
  year = {1998},
  doi = {10.3133/ofr97470a},
  url = {https://pubs.usgs.gov/publication/ofr97470A},
  note = {Source identifier: ofr97470A}
}