@misc{indiciaeac09fa094d1a,
  title = {Paleogene coal deposits of the Wilcox group and the Indio formation of south Texas},
  author = {Robert W. Hook and Peter D. Warwick and John R. SanFilipo and Douglas J. Nichols},
  year = {2011},
  url = {https://pubs.usgs.gov/publication/70192714},
  note = {Source identifier: 70192714}
}