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  1. How to grow and plant conifers in the northeastern states /
    By: Pettis, C. R. (Clifford Robert),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture, Forest Service,1909.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
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  2. Instructions for reforesting land /
    By: Pettis, C. R. (Clifford Robert), - New York (State). Forest, Fish and Game Commission.
    Publication info: Albany :J. B. Lyon Co., state printers,1909.
    Holding Institution: University of California Libraries (archive.org)
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  3. Reforesting operations /
    By: Pettis, C. R. (Clifford Robert), - New York (State). Forest, Fish and Game Commission.
    Publication info: Albany? :State of New York, Forest, Fish and Game Commission,1910?
    Holding Institution: Library of Congress
    BHL Collections: Library of Congress
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