TY  - BOOK
AU  - Krombein, K. V.
TI  - Hymenoptera of america north of mexico synoptic catalog: agriculture monograph No-2 (united states department of agriculture)
U1  - 595.79 
PY  - 1958///
CY  - Washington
PB  - U.S. Government Printing Office
KW  - Botany
KW  - Zoology -- Animals
N1  - Hymenoptera, Entomology, Insect taxonomy, North America, Insect catalog
ER  -