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  1. By: Ludwig, C A
    Type: Article
    In: American journal of botany
    Volume: 5
    Issue: 4
    Date: 1918-04
    Page Range: 171--177
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  2. By: Ludwig, C A
    Type: Article
    In: American journal of botany
    Volume: 5
    Issue: 1
    Date: 1918-01
    Page Range: 1--31
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  3. By: Ludwig, C A - Rees, Charles Christian.
    Type: Article
    In: American journal of botany
    Volume: 5
    Issue: 2
    Date: 1918-02
    Page Range: 55--60
    Publication Info: Lancaster, Pa, Published in cooperation with the Botanical Society of America by the Brooklyn Botanic Gardens, 1914-
  4. By: Ludwig, C A
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 111
    Date: 1998
    Page Range: 418--419
    Publication Info: Washington, Biological Society of Washington,