Fossil wood and lignite of the Potomac formation

Main Author: Knowlton, Frank Hall, 1860-1926,
Other Authors: Geological Survey (U.S.),
Format: eBook
Language: English
Published: Washington, D.C. : Department of the Interior, United States Geological Survey, 1889.
Government Printing Office.
Physical Description: 1 online resource (72 pages, VII pages of plates) : illustrations.
Series: Bulletin of the United States Geological Survey ; no. 56.
Subjects:
Online Access: http://purl.fdlp.gov/GPO/gpo57645
http://pubs.usgs.gov/bul/0056/report.pdf
http://pubs.er.usgs.gov/publication/b56
http://utils.louislibraries.org/cgi-bin/lz0050.x?sitecode=LAVW?http://purl.fdlp.gov/GPO/gpo57645
connect to online version. (PDF)