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  1. Bee keeping in Porto Rico,
    By: Tower, W. V.
    Publication info: San Juan, P. R.,The Porto Rico progress publishing co.,1911.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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  2. Bee keeping in Porto Rico,
    By: Tower, W. V.
    Publication info: San Juan, P. R.,The Porto Rico progress publishing co.,1911.
    Contributed by: Cornell University Library
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  3. Bees in Porto Rico.
    By: Tower, W. V.
    Publication info: n.p.,1910?
    Contributed by: Cornell University Library
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