@misc{indiciae9efe55fb6a63,
  title = {Measurement of slope deformation using quadrilaterals},
  author = {Rex L. Baum and Arvid M. Johnson and Robert W. Fleming},
  year = {1988},
  doi = {10.3133/b1842b},
  url = {https://pubs.usgs.gov/publication/b1842B},
  note = {Source identifier: b1842B}
}