TY  - BOOK
AU  - Grout,Frank F.
AU  - Soper,E.K.
TI  - Preliminary report on the clays and shales of Minnesota
PY  - 1914///
CY  - Minneapolis
PB  - The University of Minnesota
KW  - Geología económica
KW  - Arcilla
KW  - Pizarra no metamórfica
KW  - Minnesota
KW  - Libro
ER  -