@misc{indiciae519c42cc5350,
  title = {Reconnaissance survey of the helium content of soil gas in Black Hawk, Eldorado Springs, Evergreen, Golden, Morrison, Ralston Buttes, and Squaw Pass quadrangles, Colorado},
  author = {G. Michael Reimer and C.W. Adkisson},
  year = {1977},
  doi = {10.3133/ofr77464},
  url = {https://pubs.usgs.gov/publication/ofr77464},
  note = {Source identifier: ofr77464}
}