Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Nearly completed cataract boat.

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Don Harris and Norm Nevills work on cataract boat while William E. Nevills watches.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Don Harris holding up a cataract boat frame.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of two photographs from scrapbook page 6. Wood used in building the cataract boats, ("Super-Harbord," a laminated marine-grade plywood).

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Nearly completed cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Bow of a cataract boat frame.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 4. Cataract boat frames.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 7. Bending a panel of the cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 7. Norm Nevills cutting out transom for cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 7. Don Harris and Norm Nevills cutting out a piece for a cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Norm Nevills at work on a cataract boat frame.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Planing the floor panel where it attaches to the side panel.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 4. Partial boat frame, side panels attached to transom, Don Harris and Norm Nevills in background.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, photograph from scrapbook page 1. Nevills in his cataract boat.

Photo show a boat built by Norman Nevills for his 1938 expedition down the Green and Colorado Rivers...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 4. Don Harris and Norm Nevills work on cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Mae Nevills standing next to cataract boat frames.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Don Harris and Norm Nevills work on cataract boat while William E. Nevills watches.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Don Harris holding up a cataract boat frame.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of two photographs from scrapbook page 6. Wood used in building the cataract boats, ("Super-Harbord," a laminated marine-grade plywood).

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Nearly completed cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Bow of a cataract boat frame.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 4. Cataract boat frames.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 7. Bending a panel of the cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 7. Norm Nevills cutting out transom for cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 7. Don Harris and Norm Nevills cutting out a piece for a cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Norm Nevills at work on a cataract boat frame.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Planing the floor panel where it attaches to the side panel.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 4. Partial boat frame, side panels attached to transom, Don Harris and Norm Nevills in background.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, photograph from scrapbook page 1. Nevills in his cataract boat.

Photo show a boat built by Norman Nevills for his 1938 expedition down the Green and Colorado Rivers...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of three photographs from scrapbook page 4. Don Harris and Norm Nevills work on cataract boat.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Mae Nevills standing next to cataract boat frames.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Don Harris and Norm Nevills work on cataract boat while William E. Nevills watches.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 5. Don Harris holding up a cataract boat frame.

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of two photographs from scrapbook page 6. Wood used in building the cataract boats, ("Super-Harbord," a laminated marine-grade plywood).

Photo is one of a series showing the construction of Norman Nevill's boats used in his 1938 expediti...

Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Nearly completed cataract boat.

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Building the three "cataract" boats for the 1938 Green and Colorado River expeditions, one of four photographs from scrapbook page 3. Nearly completed cataract boat.

Abstract

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