@misc{indiciaeb8926375e8f3,
  title = {Estimated average annual ground-water pumpage in the Portland Basin, Oregon and Washington 1987-88},
  author = {C. A. Collins and T.M. Broad},
  year = {1993},
  doi = {10.3133/wri914018},
  url = {https://pubs.usgs.gov/publication/wri914018},
  note = {Source identifier: wri914018}
}