TY  - BOOK
AU  - Erdmann,C.E.
TI  - ... The Book Cliffs coal field in Garfield and Mesa counties, Colorado,
T2  - U.S. Geological survey.  Bulletin 851
AV  - QE75 .B9 no. 851
PY  - 1934///
CY  - Washington
PB  - U.S. Govt. print. off.
KW  - Coal mines and mining
KW  - Colorado
KW  - Geology
N1  - At head of title: United States Department of the interior; Bibliographical foot-notes
ER  -