TY  - BOOK
AU  - Larsen,Esper S.
AU  - Cross,Whitman
TI  - Geology and petrology of the San Juan region, southwestern Colorado,
AV  - QE75 .P9 no. 258
U1  - 557.88 
PY  - 1956///
CY  - Washington
PB  - U.S. Govt. Print. Off.
KW  - Geology
KW  - Colorado
KW  - Petrology
KW  - San Juan Mountains (Colo. and N.M.)
N1  - Part of illustrative matter folded in pocket; Selected bibliography : p. 297-299
ER  -