@misc{indiciae643e67c4a28e,
  title = {Activities and services of the U.S. Geological Survey, Denver area, Colorado},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/70039428},
  url = {https://pubs.usgs.gov/publication/70039428},
  note = {Source identifier: 70039428}
}