Coal resources of Colorado
By: by Frank D. Spencer and Margaret L. Erwin
Contributors: Erwin, Margaret L.
Series: Geological Survey circular -- 258; Geological Survey circular -- 258.
Publisher: U.S. Geological Survey
Published: 1953
Place of publication: Washington, D.C
Language: eng
Number of pages: 17
Subjects: Coal; Coal reserves
Notes: "January 1, 1953."

Progress report.