@misc{indiciae0528f8ce6093,
  title = {Introduction},
  author = {A.R. Drysdall and C.R. Ramsay and D. B. Stoeser},
  year = {1986},
  doi = {10.1016/s0899-5362(86)80064-1},
  url = {https://pubs.usgs.gov/publication/70030581},
  note = {Source identifier: 70030581}
}