TY  - BOOK
AU  - Wassink, E. C.
TI  - Different bumble bees visiting Digitalis purpurea and its forma Heptandra
T2  - Mededeling landbouwhogeschool
PY  - 1975///
CY  - Wageningen
PB  - Veenman & Zonen
KW  - Abejas
KW  - Digitalis purpurea
ER  -