@misc{indiciaeadefe37fdc20,
  title = {Comparative study of ground-water quality, 1976 and 1996, and initial gain-and-loss assessment of Boulder Creek, Boulder County, Colorado},
  author = {B. W. Bruce and Christopher O’Riley},
  year = {1997},
  doi = {10.3133/wri974091},
  url = {https://pubs.usgs.gov/publication/wri974091},
  note = {Source identifier: wri974091}
}