Standards for the classification of public coal lands
By: by N. Wood Bass, Henry L. Smith, and George H. Horn.
Contributors: Smith, Henry L., 1913- joint author.; Horn, George H. 1917- joint author.
Series: Geological Survey circular 633; Geological Survey circular ;; 633.
Publisher: U.S. Dept. of the Interior
Published: 1970
Place of publication: Washington
Language: eng
Number of pages: 10
Subjects: Coal -- United States; Public lands -- United States
Notes: Bibliography: p. 10.
"A revision of the rules used in the classification of coal lands on the public domain."