Clay seams or so-called horse backs near Springfield, Illinois
By: T.E. Savage
Contributors: Society of Economic Geologists (U.S.)
Publisher: The Economic Geology Publ. Co.
Published: 1910
Place of publication: New Haven, Conn
Language: eng
Number of pages: 187
Subjects: Clay
Notes: Reprinted from Economic Geology, vol. v., no. 2, March, 1910.