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  1. By: Ahlgren, Gilbert H. (Gilbert Harold) - Anderson, John C. (Rutgers U. Farm Crops)
    Type: Article
    In: Journal of the New York Botanical Garden
    Volume: 49
    Issue: 577
    Date: 1948-01
    Page Range: 1--13
    Publication Info: Lancaster, Pa Published for the Garden by the New Era Printing Co 1900-