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by Brock, Gregory W.; Barnard, Charles P.
by Gregory, Charles Noble
by James Welty (Oregon State Univ.); Charles E. Wicks; Gregory L. Rorrer; et al.
by Gregory, Augustus Charles
by Lawrence, Daniel; Gregory, Charles A.; Parmelee, Franklin
by Gregory, Charles Currie
by Ettensohn, Charles E.; Wessel, Gary M.; Wray, Gregory