Manuscripts
Start of San Juan survey 6 miles west of Bluff. The boatman in the distance is Bert Loper
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Bert Loper at left and kelly W. Trimble at right. Bert was in his prime as head boatman of the USGS San Juan Survey. Glen Canyon
Manuscripts
mssMarston papers V160/0100

Bert Loper. Glen Canyon during the San Juan Survey by the USGS
Manuscripts
mssMarston papers V160/0103

Green River Investigation: Bert Loper--Head Boatman at Rippling Brook
Manuscripts
mssMarston papers V111/0158.02
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Bert Loper
Manuscripts
Professional and personal papers of Otis R. Marston and his collection of the materials on the history of Colorado River and Green River regions.
mssMarston papers

The boats of the San Juan survey and one boat of the Cataract Canyon survey at the mouth of the San Juan River
Manuscripts
mssMarston papers V179/0136
