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  1. Plant quarantine conference - May 15, 1922. [Purpose, etc.]
    By: United States.
    Publication info: Washington,1922
    Contributed by: Cornell University Library
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  2. Rules and regulations governing the movement of plants and plant products into and out of the District of Columbia, effective on and after September 1, 1920.
    By: United States.
    Publication info: Washington, D.C.1920
    Contributed by: Cornell University Library
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