TY  - BOOK
AU  - Bradley,Wilmot Hyde
TI  - Origin and microfossils of the oil shale of the Green River formation of Colorado and Utah,
T2  - U. S.  Geological Survey.  Professional paper 168
AV  - QE75 .P9 no. 168
PY  - 1931///
CY  - Washington
PB  - U.S. Govt. Print. Off.
KW  - Oil-shales
KW  - Paleontology
KW  - Colorado
KW  - Utah
KW  - Micropaleontology
N1  - At head of title: United States Department of the Interior; Bibliographical foot-notes
ER  -