TY  - BOOK
AU  - Geesink, R
AU  - Leeuwenberg, A.J.M
AU  - Ridsdale, C.E
TI  - Thonner's analytical key to the families of flowering plants
SN  - 9022007308
U1  - 582.13 
PY  - 1981///
CY  - London
PB  - Leiden University Press
KW  - Botanical sciences
KW  - Pure Sciences
KW  - Classification
KW  - Flowering plants
ER  -