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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Church, Margaret B. (Margaret Brooks),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1923
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Thom, Charles, - Church, Margaret B. (Margaret Brooks),
    Type: Article
    In: American journal of botany
    Volume: 8
    Issue: 2
    Date: 1921-02
    Page Range: 103--126
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Thom, Charles, - Church, Margaret B. (Margaret Brooks),
    Type: Article
    In: American journal of botany
    Volume: 5
    Issue: 2
    Date: 1918-02
    Page Range: 84--104
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-