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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pretz, Harold W
    Type: Article
    In: Rhodora
    Volume: 17
    Date: 1915
    Page Range: 125--128
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  2. By: Pretz, Harold W
    Type: Article
    In: Rhodora
    Volume: 21
    Date: 1919
    Page Range: 128--132
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  3. By: Pretz, Harold W
    Type: Article
    In: American fern journal
    Volume: 1
    Date: 1911
    Page Range: 137--141
    Publication Info: [Washington, etc.] American Fern Society