Manuscripts
Up Grand Canyon from Mile 240.2 showing Rapid 248 by Cogswell's tally and he also numbered it #4, part of Separation Rapid
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Up at Desolation Canyon at Mile 40.5 showing the rapid which Cogswell counted as #51
Manuscripts
mssMarston papers V117/0116
Route up to lava cap at Lava Cliff. Rapid used for portage of dunnage. Grand Canyon. Mile 246
Manuscripts
mssMarston papers V141/0093
Image not available
Separation Canyon and Rapid: Mile 239-240
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
Image not available
Separation Canyon and Rapid: Mile 239-240
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
