TY  - BOOK
AU  - Clausen, Jens.
TI  - Experimental studies on the nature of species
U1  - 581.52 
PY  - 1940///-48
CY  - Washington
PB  - Carnegie Institution
KW  - Botánica
KW  - E.U.A
KW  - Ecología vegetal
KW  - Herencia
N1  - Contenio: v.1 Effect of varied environments on western north american plants -- v.2 Plant evolution throught amphiploidyand autoploidy, with... -- v.3 Environmental responses of climatic roces of achillea
ER  -