@misc{indiciae26a550ebb4cd,
  title = {Geology and construction-material resources of Nemaha County, Kansas},
  author = {Melville Rhodes Mudge and Charles Philip Walters and Ralph E. Skoog},
  year = {1959},
  doi = {10.3133/b1060d},
  url = {https://pubs.usgs.gov/publication/b1060D},
  note = {Source identifier: b1060D}
}