TY  - BOOK
AU  - Cannon,William F.
AU  - Nicholson,Suzanne W.
ED  - United States
TI  - Revisions of stratigraphic nomenclature within the Keweenawan supergroup of northern Michigan
U1  - 551.71509774 20th ed.
PY  - 1992///].
CY  - [Washington]: 
PB  - [United States Government Printing Office], 
KW  - Geology, Stratigraphic
KW  - Proterozoic
KW  - Volcanic ash, tuff, etc
KW  - Michigan
KW  - Rhyolite
KW  - Keweenaw Peninsula
KW  - Porcupine Volcanics (Michigan)
KW  - Bergland Group (Michigan)
KW  - Copper Harbor Conglomerate (Michigan)
KW  - Portage Lake Volcanics (Michigan)
N1  - Chapters A and B are issued as a single volume and are not available separately; Includes bibliographical references (p. A8) and (p. B35-B39)
ER  -