[Penetration charts].

Bibliographic Details
Corporate Author:	Wyoming Geological Association. Nomenclature Committee
Format:	Serial
Language:	English
Published:	[Casper, Wyo.?] [publisher not identified] ;
Subjects:	Geology > Wyoming.

Description
Item Description:	Information obtained from records of the Conservation Division of U.S. Geological Survey; State of Wyoming; oil companies; and other sources believed to be reliable.
Physical Description:	volumes : graphs.