@misc{indiciae97cbb861f13a,
  title = {Investigation of foundation problems related to heaving of soils and weathered bedrock in the Pierre Shale southwest of Denver, Colorado},
  author = {T. C. Nichols and D. D. Eberl and R. A. Williams and K. W. King},
  year = {1991},
  doi = {10.3133/ofr91281},
  url = {https://pubs.usgs.gov/publication/ofr91281},
  note = {Source identifier: ofr91281}
}