TY  - BOOK
AU  - Muesebeck, C. F. W.
AU  - Krombein, Karl V.
TI  - Hymenoptera of America north of Mexico: Synoptic catalog  
U1  - PA 595.79 M8 1951 
CY  - Washington, D. F.
PB  -  U. S. Government printing office
KW  - Himenopteros
KW  -  Estados Unidos
KW  - Insectos
KW  -  catalogos y colecciones
ER  -