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  1. By: Conwentz, Hugo,
    Publication info: Cambridge [England], University Press, 1909
    Holding Institution: Harvard University Botany Libraries
    Subjects: Landscape protection  Natural monuments  
  2. By: Maryland. State Planning Dept. - Smithsonian Institution. Center for Natural Areas.
    Publication info: Baltimore, The Department, 1975
    Holding Institution: University of Maryland, College Park
    Subjects: Maryland  Natural areas  Natural monuments  Natural resources  
  3. By: United States. Forest Service.
    Publication info: [Washington, D.C.?], Forest Service, U.S. Dept. of Agriculture, [2003?]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Forest reserves  Historic buildings  Landscape protection  Natural monuments  Recreational use  Remodeling for other use  Wisconsin  
  4. By: Goodwin, Richard H. (Richard Hale), - Niering, William A.
    Publication info: [Washington], National Park Service : may be purchased from the Supt. of Docs., Govt. Print. Off, 1975
    Holding Institution: MBLWHOI Library
    Subjects: Natural monuments  United States  Wetlands  
  5. By: Fitch, Henry S. (Henry Sheldon)
    Publication info: Lawrence, University of Kansas, Museum of Natural History, 1952
    Holding Institution: Smithsonian Libraries and Archives
    Subjects: Kansas  Natural monuments