Coal resources of the United States, January 1, 1967 a summary and analysis of information concerning the quantity and distribution of coal in the United States /
|Main Author:||Averitt, Paul, 1908-1991,|
|Other Authors:||Geological Survey (U.S.),|
[Washington, D.C.] :
United States Department of the Interior, Geological Survey,
1 online resource (vi, 116 pages) : illustrations.
Geological Survey bulletin ;