@misc{indiciae3ff5c1c0deb8,
  title = {Age provinces in the basement rocks of Liberia},
  author = {Carl E. Hedge and Richard F. Marvin and Charles W. Naeser},
  year = {1975},
  url = {https://pubs.usgs.gov/publication/70232613},
  note = {Source identifier: 70232613}
}