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81.
The geology of the Ward region, Boulder County, Colorado, by P. G. Worcester. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Denver, Eames bros., state printers [1920]
Availability: No items available.

82.
Preliminary report on the underground waters of a part of southeastern Colorado, by R. C. Coffin and A. J. Tieje. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Denver, Col., Eames brothers, state printers, 1921
Availability: No items available.

83.
Oil shales of Colorado, by R. D. George. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Denver, Col., Eames brothers, state printers, 1921
Availability: No items available.

84.
... Short papers from the Cooperative Oil-Shale Laboratory, by Martin J. Gavin and Leslie H. Sharp. by Series: Colorado. Cooperative Oil Shale Investigation. Bulletin ; no. 1
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Denver, Col., Eames brothers, state printers, 1921
Availability: No items available.

85.
Notes on the geology of the line of the proposed Moffat tunnel, by R. D. George. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Boulder, Col., Colorado Geological Survey, 1922
Availability: No items available.

86.
... The twentymile park district of the Yamps coal field, Routt county, Colorado, by Marius R. Campbell. by Series: U.S. Geological survey. Bulletin 748
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, Govt. Print. Off., 1923
Availability: No items available.

87.
Report based on reconnaissance investigation of Arizona land irrigable from the Colorado River. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: [Phoenix, Ariz.] Arizona Engineering Commission, 1922-23.
Availability: No items available.

88.
89.
Preliminary notes on the revision of the geological map of eastern Colorado, by W. C. Toepelman. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Boulder, Col., 1924
Availability: No items available.

90.
Geology and ore deposits of the Red Cliff district, Colorado, by R. D. Crawford and Russell Gibson. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Boulder, Col., Camera print, 1925
Availability: No items available.

91.
Geology and coal resources of the Axial and Monument Butte quadrangles, Moffat County, Colorado, by E. T. Hancock. by Series: U.S. Geological survey. Bulletin 757
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, Govt. print. off., 1925
Availability: No items available.

92.
Commentaire de l'Atlas of Colorado (1877), par Emm. de Margerie ... by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Paris, Imprimerie nationale, 1925
Availability: No items available.

93.
Pre-Cambrian rocks of Gunnison river, Colorado, by J. Frederick Hunter. by Series: U.S. Geological survey. Bulletin 777
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, Govt. print. off., 1925
Availability: No items available.

94.
Oil and water possibilities of parts of Delta and Mesa counties, Colorado, by Herbert J. Weeks. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Boulder, Col., Camera print, 1925
Availability: No items available.

95.
Guides to ore in the Leadville district, Colorado, by G. F. Loughlin. by Series: U.S. Geological survey. Bulletin 779
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, Govt. print. off., 1926
Availability: No items available.

96.
97.
Correlation of geologic formations between east-central Colorado, central Wyoming and southern Montana / Willis T. Lee. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington : Gov't. Print. Off., c1927
Availability: No items available.

98.
Upper Colorado river and its utilization/ by Robert Follansbee. by Series: Geological Survey water-supply paper ; 617.
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington: for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1929
Availability: No items available.

99.
The Green River and its utilization, by Ralf R. Woolley by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington, U.S. Govt. Print. Off., 1930
Availability: No items available.

100.
The flora of the Denver and associated formations of Colorado / by Frank Hall Knowlton ; a posthumous work edited by Edward Wilber Berry. by
Material type: Text Text; Format: print ; Literary form: Not fiction
Publication details: Washington : U.S. Gov't. Print. Off., 1930
Availability: No items available.

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