Geology of volcanic rocks in the south half of the Ishpeming Greenstone belt, Michigan.  by Theodore J. Bornhorst and Rodney C. Johnson
Contributors: Johnson, R.C.
Publisher: Dept. of the Interior
Place of publication: Washington
Language: eng
Number of pages: 13
Subjects: Geology - Michigan; Volcanic ash, tuff, etc. - Michigan
Notes: 11