TY  - BOOK
AU  - Krombein,Karl V.
TI  - Trap-nesting  wasps  and bees  : : life histories, nests and associ ates / 
U1  - 595.79 KRO 
PY  - 1967///
CY  - Washington : 
PB  - Smithsonian  Press , 
KW  - Wasps
KW  - Bees
ER  -