TY  - BOOK
AU  - Campbell,Marius R.
TI  - ... The twentymile park district of the Yamps coal field, Routt county, Colorado,
T2  - U.S.  Geological survey.  Bulletin 748
AV  - QE75 .B9 no. 748
PY  - 1923///
CY  - Washington
PB  - Govt. Print. Off.
KW  - Coal
KW  - Colorado
KW  - Routt County
N1  - At head of title: Department of the Interior; Map folded in pocket
ER  -