TY  - BOOK
AU  - Grout,Frank F.
AU  - Soper,Edgar Kirke
ED  - Geological Survey (U.S.)
ED  - University of Minnesota.
TI  - Preliminary report on the clays and shales of Minnesota,
T2  - Minnesota. Geological survey.  Bulletin 11
AV  - TN942 .G8
PY  - 1914///
CY  - Minneapolis
PB  - The University of Minnesota
KW  - Clay
KW  - Minnesota
N1  - At head of title: The University of Minnesota; In cooperation with the United States geological survey
ER  -