APA (7th ed.) Citation

Johnson, R. B. (1958). Geology and coal resources of the Walsenburg area, Huerfano County, Colorado. [United States Department of the Interior, Geological Survey].

Chicago Style (17th ed.) Citation

Johnson, Ross B. Geology and Coal Resources of the Walsenburg Area, Huerfano County, Colorado. [Washington, D.C. ]: [United States Department of the Interior, Geological Survey], 1958.

MLA (9th ed.) Citation

Johnson, Ross B. Geology and Coal Resources of the Walsenburg Area, Huerfano County, Colorado. [United States Department of the Interior, Geological Survey], 1958.