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Social Bees and Wasp (ins.: Hymenoptera, Apidae and Vespidae) from the Estuary of the River Ängerän, Sweden

Bo G. Svensson

出版	Umeå University, Department of Ecological Zoology, 1979
URL	http://books.google.com.hk/books?id=PXZnHAAACAAJ&hl=&source=gbs_api