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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Wittrock, Marion - Wittrock, G. L.
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 43
    Issue: 507
    Date: 1942-03
    Page Range: 57--71
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-
  2. By: Wittrock, Marion - Wittrock, G. L.
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 43
    Issue: 507
    Date: 1942-03
    Page Range: 76--86
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-