Manuscripts
Start of San Juan survey 6 miles west of Bluff. The boatman in the distance is Bert Loper
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Start of San Juan Boat trip, 6 miles west of Bluff. The boatman in the distant boat appears to be Bert Loper
Manuscripts
mssMarston papers V123/0057

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

The San Juan group the morning we started for Lees Ferry. USGS San Juan survey. Robert Allen; Hugh Hyde; Elwyn Blake; Bert Loper; Kelly Trimble
Manuscripts
mssMarston papers V183/0095

The San Juan Group the morning we started for Lees Ferry. USGS survey of the San Juan River. Christensen; Hyde; Blake; Loper; Trimble
Manuscripts
mssMarston papers V183/0093

Green River Investigation: Bert Loper--Head Boatman at Rippling Brook
Manuscripts
mssMarston papers V111/0158.02