@misc{indiciae6cbd78a1360a,
  title = {Contributions to economic geology (short papers and preliminary reports), 1930, Part I, Metals and nonmetals except fuels. A geologic study of the Madden Dam project, Alhajuela, Canal Zone},
  author = {Frank Reeves and C. P. Ross},
  year = {1931},
  doi = {10.3133/b821b},
  url = {https://pubs.usgs.gov/publication/b821B},
  note = {Source identifier: b821B}
}