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  1. By: Willits, C. O. (Charles Oliver), - Hills, Claude Hibbard,
    Edition: Slightly rev.
    Publication info: Washington :Agricultural Research Service, U.S. Dept. of Agriculture : for sale by the Supt. of Docs., U.S. Govt. Print. Off.,1976.
    Holding Institution: Prelinger Library (archive.org)
    Subjects: Maple sugar  Maple syrup  
  2. By: Spencer, James Burns,
    Publication info: Ottawa :Government printing bureau,1913.
    Holding Institution: University of California Libraries (archive.org)
    Subjects: Maple sugar  Maple syrup  
  3. By: Bryan, A. Hugh (Albert Hugh),
    Publication info: Washington,Govt. print. off.,1908
    Holding Institution: University of California Libraries (archive.org)
    Subjects: Maple sugar  Maple syrup  
  4. By: Hortvet, Julius,
    Publication info: Washington,Govt. print. off.,1905]
    Holding Institution: University of California Libraries (archive.org)
    Subjects: Maple sugar  Maple syrup  
  5. By: Pendergast, James F. - National Museum of Natural Sciences (Canada). Botany Division.
    Publication info: Ottawa :National Museums of Canada, National Museum of Natural Sciences,1982.
    Holding Institution: Canadian Museum of Nature Library / Bibliothèque du Musée canadien de la nature
    Subjects: Maple sugar