@misc{indiciaeda995670dd48,
  title = {Surface-water resources of the Yobe River system, Northern Nigeria, 1963-68},
  author = {B.E. Colson},
  year = {1969},
  doi = {10.3133/25251},
  url = {https://pubs.usgs.gov/publication/25251},
  note = {Source identifier: 25251}
}