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  1. By: Babcock, E. B. (Ernest Brown), - Clausen, Roy Elwood,
    Edition: 1st ed.
    Publication info: New York, McGraw-Hill book company, inc.; [etc., etc.], 1918
    Holding Institution: Multiple institutions
  2. By: Setchell, William Albert, - Clausen, Roy Elwood, - Goodspeed, T. H. (Thomas Harper),
    Publication info: Berkeley, Calif, University of California press, 1922
    Holding Institution: University Library, University of Illinois Urbana Champaign
  1. By: Goodspeed, T. H. (Thomas Harper), - Clausen, Roy Elwood,
    Type: Article
    In: American journal of botany
    Volume: 2
    Issue: 7
    Date: 1915-07
    Page Range: 332--374
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-