@misc{indiciaea41558ca2479,
  title = {APRAS; analytic petroleum resource appraisal system; microcomputer programs for play analysis using a field-size model},
  author = {Robert A. Crovelli and Richard H. Balay},
  year = {1992},
  doi = {10.3133/ofr9221},
  url = {https://pubs.usgs.gov/publication/ofr9221},
  note = {Source identifier: ofr9221}
}