TY  - BOOK
AU  - Bell,C.Ritchie
TI  - Plant variation and classification
U1  - 581.15 
PY  - 1967///
CY  - Belmont, Calif.
PB  - Wadsworth Pub. Co
KW  - Plants
KW  - Classification
KW  - Variation
N1  - Bibliography: p. 121-125
ER  -