@misc{indiciae226daa9291f7,
  title = {Oil and gas resource assessment areas, U. S. Geological Survey, Geologic Division, 1980; Lower 48 states, regions 2 through 11, and 2A, 6A, and 11A},
  author = {K. L. Varnes and A. B. Coury and G.L. Dolton and S. E. Frezon and A. S. Khan and R. S. Pike and R. B. Powers and E. W. Scott},
  year = {1980},
  doi = {10.3133/ofr8184c},
  url = {https://pubs.usgs.gov/publication/ofr8184C},
  note = {Source identifier: ofr8184C}
}