@misc{indiciae738891e3aeab,
  title = {Manganese deposits of the Flat Top and Round Mountain districts, Bland and Giles Counties, Virginia},
  author = {Harry Stephen Ladd and Frank Walter Stead},
  year = {1944},
  doi = {10.3133/b940h},
  url = {https://pubs.usgs.gov/publication/b940H},
  note = {Source identifier: b940H}
}