The coal fields of the United States
By: General introduction, by Marius R. Campbell; Ohio, by J. A. Bownocker.
Contributors: Campbell, Marius Robinson, 1858-1940.
Series: U.S. Geological survey. Professional paper; 100
Publisher: U.S. Govt. print. off.
Published: 1929
Place of publication: Washington
Language: eng
Number of pages: 101
Subjects: Coal -- Ohio.; Coal -- United States.
Notes: At head of title: Department of the interior.
Issued also as House doc. no. 1806, 64th Cong., 2d sess.