Formation of coal beds
By: by John J. Stevenson
Publisher: Press of the New Era Printing Company
Published: 1911
Place of publication: Lancaster, Pa
Language: eng
Number of pages: 530
Subjects: Coal
Notes: Proceedings of the American Philosophical Society, vol. L, 1911; vol. LI, 1912, vol. LII, 1913.

Includes bibliographical references.