Manuscripts
One of the Mexican Hat Expedition sadirons in Horn Creek. Bright Angel gauge: July 19: 19,700 cfs. July 20: 18,500 cfs. July 21: 17,400 crfs
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Horn Creek Rapid. Bright Angel gauge: July 19: 19,700 cfs. July 20: 18,500 cfs. July 21: 17,400 cfs
Manuscripts
mssMarston papers P005/0230

John Harper dropping into Horn Creek Rapid. Bright Angel gauge: July 18: 21,000. July 19: 19,700. July 20: 18,500. July 21: 17,400
Manuscripts
mssMarston papers P005/0232

Frank Wright in Monument Creek Rapid. Bright Angel gauge: July 18: 21,000. July 19: 19,700. July 20: 18,500. July 21: 17,400
Manuscripts
mssMarston papers P005/0233

Frank Wright in Monument Creek Rapid. Bright Angel gauge: July 18: 21,000. July 19: 19,700. July 20: 18,500. July 21: 17,400
Manuscripts
mssMarston papers P005/0234

John Harper in the sadiron "Mexican Hat III." Top of Horn Creek Rapid. Bright Angel gauge: 8,750 cfs
Manuscripts
mssMarston papers V066/0072

The sadirons of the Mexican Hat Expeditions at approximately Mile 63. Preliminary gauge: 13,300 cfs
Manuscripts
mssMarston papers V056/0015