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by Raymond B. Cowles, in collaboration with Elna S. Bakker ; foreword by Robert C. Stebbins ; ill. by Gerhard Bakker ; photos. by Raymond B. Cowles and Roy Pence
University of California Press c1977
Available at 1 libraries
by Raymond B. Cowles
University of California Press 1959
Available at 4 libraries
by Raymond Bridgman Cowles
[s.n.] 1930
