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The Use of Pollen Traps and Pollen Supplements in Developing Honeybee Colonies

C. W. SchaeferClayton Leon Farrar

出版	United States Department of Agriculture, Bureau of Entomology and Plant Quarantine, 1946
URL	http://books.google.com.hk/books?id=tyNZtQAACAAJ&hl=&source=gbs_api