Manuscripts
Bert Loper. Glen Canyon during the San Juan Survey by the USGS
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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 in Glen Canyon as a crewman with Dave Rust's party. Bert visited the steps at El Vado on this trip
Manuscripts
mssMarston papers V160/0104
