Earhart, R. L. (1981). The conterminous United States mineral appraisal program: Background information to accompany folio of geologic, geochemical, geophysical, and mineral resource maps of the Choteau 1 Ì⁽x 2 Ì⁽quadrangle, Montana. United States Department of the Interior, Geological Survey.
Chicago Style (17th ed.) CitationEarhart, Robert L. The Conterminous United States Mineral Appraisal Program: Background Information to Accompany Folio of Geologic, Geochemical, Geophysical, and Mineral Resource Maps of the Choteau 1 Ì⁽x 2 Ì⁽quadrangle, Montana. [Reston, Virginia]: United States Department of the Interior, Geological Survey, 1981.
MLA (9th ed.) CitationEarhart, Robert L. The Conterminous United States Mineral Appraisal Program: Background Information to Accompany Folio of Geologic, Geochemical, Geophysical, and Mineral Resource Maps of the Choteau 1 Ì⁽x 2 Ì⁽quadrangle, Montana. United States Department of the Interior, Geological Survey, 1981.