Bee keeping in Porto Rico Tower, Winthrop Vose creator text book San Juan, P. R The Porto Rico progress publishing co 1911 1911
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ENG Under the supervision of Office of experiment stations. U. S. Dept. of agriculture. Bees Puerto Rico Porto Rico agricultural experiment station ... Circular, No. 13 https://www.biodiversitylibrary.org/bibliography/54860 63352296 10.5962/bhl.title.54860 NIC