@misc{indiciae5e04e5f4a7c2,
  title = {Median-porosity contour maps of the J Sandstone, Dakota Group, in the Denver Basin, Colorado, Nebraska, and Wyoming},
  author = {D.K. Higley and D. L. Gautier},
  year = {1987},
  doi = {10.3133/mf1982},
  url = {https://pubs.usgs.gov/publication/mf1982},
  note = {Source identifier: mf1982}
}