UNIVERSITY MUSEUM, UNIVERSITY OF PENNSYLVANIA
MERRIAM, DR. C. HART: U. S. DEPARTMENT OF AGRICULTURE
STOOKEY, S. DONALD; SMITHSONIAN INSTITUTION
POHL, ERWIN R.; SMITHSONIAN INSTITUTION
ROEDER, KENNETH D.; TREAT, ASHER E.; SMITHSONIAN INSTITUTION
JOHNSTON, EARL S.; SMITHSONIAN INSTITUTION
MOURANT, A. E.; SMITHSONIAN INSTITUTION
RUSSELL, ISRAEL C.
ANTIQUARIAN BOOKSELLERS' ASSOCIATION
TOBEY, MARK; SEATTLE ART MUSEUM
MAXIM, HUDSON; illustrations by OBERHARDT, WILLIAM
BURNS, VINCENT GODFREY
ARNOLD, RALPH; ANDERSON, ROBERT; ALLEN, IRVING C.
BRYAN, KIRK; U. S. GEOLOGICAL SURVEY
SCHUBERT, CHARLES; DUNBAR, CARL O.
SIEGAL, MORDECAI; MARGOLIS, MATTHEW
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