Manuscripts
Loper in a rapid. USGS survey trip from Green River, Wyoming, to Green River, Utah. Note the boxes on the hatch covers which were seats for Woolley and Trimble in the fashion of Powell
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USGS Survey - Green River Wyoming to Green River, Utah - Loper's Account, Typescript from Hunt, Blake File
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 Powell's Second Expedition on the Beach at Green River, Wyoming
Manuscripts
mssMarston papers V179/0004

Loper at the oars in a small rapid in Red Canyon. Trimble and Woolley are riding with him
Manuscripts
mssMarston papers V107/0032

"Views on the Green River." Powell's second party at Green River, Wyoming. Ready to Start
Manuscripts
mssMarston papers V105/0070

