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  1. Maple sirup producers manual / by C. O. Willits and Claude H. Hills.
    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.
    Contributed by: Prelinger Library (
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