TY  - GEN
AU  - Clausen,Jens
TI  - Experimental studies on the nature of species: I. effect of varied environments on Western North American plants 
T2  - Carnegie Institution of Washington Publication 
AV  - SPE-B 05826 
PY  - 1940///
CY  - Washington, D.C., 
PB  - Carnegie Institution of Washington Publication
KW  - Plant ecology
KW  - Heredity
ER  -