Template:Muesebeck, Krombein & Townes, 1951a

• Muesebeck, C.F.W., Krombein, K.V. & Townes, H.J. 1951. Hymenoptera of America north of Mexico—Synoptic Catalog. U.S. Dept. Agriculture Monograph No. 2. 1420 pp.  
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