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<br />'J2'~ <br /> <br />Susie Reilly. Susie Reilly accompanied P.T. on interviewed in August 1994; he loaned us photographs <br />his Grand Canyon trips and was one of the first 12 and movies for our interpretations. After the trip, <br />women to go through Grand Canyon by boat. She kept several participants sent notes and photographs for our <br />a diary that was used in this work. Susie died in 200 I. use. Specific information on changes near Lee"s Ferry <br />Boh Sharp. Sharp, a world-renowned are given in Reilly (]999). The combination of diaries, <br />geomorphologist from the California Institute of photographs. and direct observations of the Old Timers <br />Technology, first nm the Colorado River through provide considerable information on pre-dam <br />Grand Canyon in ]937 with the Carnegie - Cal Tech conditions between 1872 and 1963, particularly <br />\ Expedition. During that trip, he met Buzz Holmstrom between 1938 and 1963. <br />at Diamond Creck (mile 225.8-L). He loaned us his <br />diary. his photographs, and a summary of the trip for <br />our work. Repeat Photography <br />Hal Stephens. Stephens was the photographer for <br />the U.S. Geological Survey expedition in 1968 that We have replicated approximately 1,400 <br />replicated photographs taken by the 1871-72 Powell photographs of Grand Canyon and its tributaries during <br />Expedition. With Gene Shoemaker. Stephcns the course of this project. Photographs were obtained <br />reoccupied numcrous camera stations that Jack Hillers from numerous archives, most notably the National <br />established in 1872 in Grand Canyon and published his Archives, College Park. Maryland; the U.S. Geological <br />work (Stephens and Shoemaker. 1987). Stephens Survey Pholographic Library, Denver, Colorado; the <br />donated his photographs and negatives to our effort. Huntington Library. San Marino, California: Special <br />Frank Wright. Frank Wright was a Nevills' Collections at the Cline Library, Northern Arizona <br />boatman who purchased Mexican Hat Expcditions with University; the MalTiott Library at the University of <br />his brother Jim after Nevills' death in 1949. He would Utah; the Bancroft Library, University of California at <br />not join the Old Timers' Trip owing to his perceived Berkeley; and private individuals. Examples of repeat <br />ideas of Ihe changes in Grand Canyon that resulted photography in Grand Canyon appear in Turner and <br />from construction of Glen Canyon Dam. Karpiscak ( 1980), Stephens and Shoemaker (1987). <br />Other huen'iews. In addition to the Old Timers, Webb and others (1991), Webb (1996), Melis and <br />we had six guides with long experiences in Grand others (1996), Melis (1997) and Webb and others <br />Canyon: Alistair Bleifuss. Ann Cassidy. Brad Dimock, (1999a; 1999b). Although our results here rely <br />Brian Dierker, Kenton Grua, and Lew Steiger. These primarily on written and oral accounts of change. <br />guides provided key information on changes in the repeat pholography is used to support or refute those <br />river during the I 970s and just before and during the observations. <br />1983 flood. . " <br /> <br />Diaries and Other Accounts <br /> <br />Additional information was obtained from the <br />diaries of historic river runners (Table I). The e.\ploits <br />of these river runners are documented in Lavender <br />(1985). The diaries of Norman D. Nevills and P.T. <br />Reilly were made available as a result of the Old <br />Timers Trip. The diaries of the 1923. U.S. Geological <br />Survey expedition were obtained from the National <br />Archives in College Park, Maryland. Other diaries -- <br />including those of Frank Wright. Georgie White, and <br />Otis "Dock" Marston -- were obtained froI11 the <br />Marston Collection at the Huntington Lib",ry in San <br />Marino, California (Table I). Many diaries from early <br />river trips are published (Table 1). Bill Beer was <br /> <br />Interviews and Interpretation of <br />Observations <br /> <br />We listened and tried not to intentionally prompt <br />the Old Timers. After an introduction to debris flows, <br />types of sand bars, and the basic purpose of the trip, we <br />simply recorded their responses to the canyon. We <br />deliberately let many sites pass without discussing <br />some obvious changes that have OCCUlTed since 1982. <br />In several cases. places identified as critical camping <br />beaches or habitat for endangered species were passed <br />without comment by either the scientists or the Old <br />Timers. <br />We devised some simple tests of the veracity of <br />the Old Timers' memories. For example, we asked <br />whether Bedrock and Dubcndorff Rapids had changed <br />- , <br /> <br />SOURCES OF INFORMATION 5 <br />