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1
Ulmus 'Patriot' : U.S. National Arboretum plant introduction : floral and nursery plants research unit.
[Washington, DC] (3501 New York Ave., N.E., Washington 20002) : [U.S. National Arboretum, U.S. Dept. of Agriculture, Agricultural Research Service], 1998

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2
Instrumental insemination of queen bees /

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