TY  - BOOK
AU  - Perry,Eugene S.
TI  - Montana in the geologic past
T2  - Montana. Bureau of Mines and Geology. Bulletin 26
AV  - QE133 .P46
PY  - 1962///
CY  - Butte
PB  - Montana School of Mines
KW  - Geology
KW  - Montana
N1  - Bibliography: p. 77-78
ER  -