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<br />Table 1. Diaries from historical river trips in Grand Canyon used in this study. <br />Date ofTrip Author Part of Canyon Source of Material <br />1869 Powell expedition All Cooley, 1988 <br />1872 F. S. Dellenbaugh Lees Ferry to Kanab Creek Dellenbaugh, 1908 <br />1872 J. K. Hillers Lees Ferry to Kanab Creek Fowler, 1972 <br />1890 R. B. Stanton All Smith and Crampton, 1987 <br />1890 W. H. Edwards All Unpublished diary <br />1896 G. Flavell All Flavell, 1987 <br />1909 J. Stone All Stone, 1932 <br />1911 E. Kolb All Kolb, 1914 <br />1911 B. Lauzon Phantom to Grand Wash Cliffs Unpublished diary <br />1923 USGS Expedition All Unpublished diary <br />1927 C. Eddy All Eddy,1929 <br />1928 J. Harbin Phantom to Diamond Creek Unpublished interview <br />1937 1. Campbell All Unpublished diary <br />1937 B. Sharp All Unpublished diary <br />1937 B. Holmstrom All Unpublished diary <br />1938 N. Nevills All Unpublished diary <br />1938 1. Jotter Lees Ferry to Granite Rapid Unpublished diary <br />1938 E. Clover All Unpublished diary <br />1938 A. Burg All Unpublished postcards <br />1938 B. Holmstrom All Unpublished postcards <br />1938 W. Johnson All Unpublished narrative <br />1939 D. Harris All Unpublished diary <br />1940 N. Nevills All Unpublished diary <br />1940 B. Goldwater All Goldwater, 1940 <br />1940 M. Baker All Unpublished diary <br />1941 N. Nevills All Unpublished diary <br />1942 N. Nevills All Unpublished diary <br />1942 O. Marston All Unpublished diary <br />1947 N, Nevills All Unpublished diary <br />, <br />1948 N. Nevills All Unpublished diary <br />1948 F. Masland All Masland, 1948 <br />1948 1. Doerr Phantom to Grand Wash Cliffs Unpublished diary <br />1948 O. Marston All Unpublished diary <br />1948 G. Marston Lees Ferry to Bedrock Rapid Unpublished diary <br />1949 P.T. Reilly All Unpublished diary <br />1949 F. Wright All Unpublished diary ., <br />1949 H. Welty Lees Ferry to Phantom Unpublished diary <br />1950 F. Wright All Unpublished diary <br />1950 S. Reilly Phantom to Grand Wash Cliffs Unpublished diary <br />1951 D. Harris All Unpublished diary <br />1951 F. Wright All Unpublished diary <br />1951 J. Desloge All Unpublished diary <br /> <br />6 OBSERVATIONS OF ENVIRONMENTAL CHANGE IN GRAND CANYON <br />