@misc{indiciaedc32bb2ca6c5,
  title = {Aggregate and riprap resources map of the Wolf Point area, Montana},
  author = {R. B. Colton},
  year = {1964},
  doi = {10.3133/i429},
  url = {https://pubs.usgs.gov/publication/i429},
  note = {Source identifier: i429}
}