@misc{indiciae923783d8948f,
  title = {Map showing percolation rates of earth materials in western Whatcom County, Washington},
  author = {D. J. Easterbrook},
  year = {1973},
  doi = {10.3133/i854a},
  url = {https://pubs.usgs.gov/publication/i854A},
  note = {Source identifier: i854A}
}