@misc{indiciae227b7b98fd3f,
  title = {Elevation contours of the bedrock surface, North Platte 1- by 2-degree Quadrangle, Nebraska, digitized from a published 1:250,000-scale geologic map},
  author = {Ronald B. Zelt},
  year = {1995},
  doi = {10.3133/ofr95330},
  url = {https://pubs.usgs.gov/publication/ofr95330},
  note = {Source identifier: ofr95330}
}