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  1. By: Smith, Edgar F - Knerr, Ellsworth Brownell, - Hoskinson, W S - Ehrenfeld, Charles H
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge
    Volume: 24
    Issue: 126
    Date: 1887
    Page Range: 428--434
    Publication Info: Philadelphia, American Philosophical Society,
  2. By: Knerr, Ellsworth Brownell,
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1891-05-08
    Publication Info: [1842-1891]
  3. By: Knerr, Ellsworth Brownell,
    Type: Article
    In: Botanical gazette
    Volume: 17
    Issue: 10
    Date: 1892
    Page Range: 326--328
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991