@misc{indiciae3434f6247ae5,
  title = {Silica sand deposits in the Monrovia area, Liberia},
  author = {Sam Rosenblum and S.P. Srivastava},
  year = {1970},
  doi = {10.3133/ofr70280},
  url = {https://pubs.usgs.gov/publication/ofr70280},
  note = {Source identifier: ofr70280}
}