@misc{indiciaed76bbd743358,
  title = {Ground-water resources of the Willamette Valley, Oregon},
  author = {Arthur M. Piper},
  year = {1942},
  doi = {10.3133/wsp890},
  url = {https://pubs.usgs.gov/publication/wsp890},
  note = {Source identifier: wsp890}
}