@misc{indiciae619c8d46e309,
  title = {Interactive computer methods for generating mineral-resource maps},
  author = {James Alfred Calkins and A.S. Crosby and T.E. Huffman and A. L. Clark and G.T. Mason and R.J. Bascle},
  year = {1980},
  doi = {10.3133/cir815},
  url = {https://pubs.usgs.gov/publication/cir815},
  note = {Source identifier: cir815}
}