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Lewis and Clark's observations and measurements of geomorph..:

Moody, John A. (John Alexander), 1944- ; Jones, David R. (David Richard) ; Meade, Robert H., 1930-.
Also available via Internet from the USGS web site as a .DJVU file. Address as of 7/18/08: http://pubs.er.usgs.gov/usgspubs/cir/cir1246.  , 2003