Pre-Cambrian Rocks of the Lake Superior Region, a review of newly discovered geologic features with a revised geologic map.

Bibliographic Details
Corporate Author:	Geological Survey (U.S.)
Format:	Government Document eBook
Language:	English
Published:	[Washington] : [s.n.], 1935.
Subjects:	Geology. Lakes. Michigan. Wisconsin.
Online Access:	Electronic resource (PDF)

Description
Item Description:	Contains tables and a bibliography.
Physical Description:	1 online resource (ii+34 pages), digital, PDF file