Research results obtained in USSR concerning aetiology, pathogenesis, epizootiology, diagnosis and control of Varroa disease in bees 
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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.
Apiacta. An international technical magazine of apicultural and economic information
ISSN : 0003-6455