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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Maryland. State Planning Dept. - Smithsonian Institution. Center for Natural Areas.
    Publication info: Baltimore, The Department, 1975
    Holding Institution: University of Maryland, College Park
  2. By: Jenkins, Dale W. - Smithsonian Institution. Center for Natural Areas.
    Publication info: [Washington, D.C.], Smithsonian Center for Natural Areas, Ecology Program, Smithsonian Institution, [1973]
    Holding Institution: Smithsonian Libraries and Archives