@misc{indiciaef87ac19c9ef3,
  title = {Summary of data available for Morocco as of June 10, 1977},
  author = {Glen F. Brown},
  year = {1980},
  doi = {10.3133/ofr80520},
  url = {https://pubs.usgs.gov/publication/ofr80520},
  note = {Source identifier: ofr80520}
}