TY  - BOOK
AU  - Howell,J.V.
TI  - Twin lakes district of Colorado,
AV  - QE91 .A4 no. 17
PY  - 1919///
CY  - Denver, Col.
PB  - Eames bros., state printers
KW  - Geology
KW  - Colorado
N1  - The author's dissertation, University of Iowa, 1922, but not published as a thesis; Bibliography: p. 16-17
ER  -