TY  - BOOK
AU  - G. Ledyard Stebbins
TI  - Basis of progressive evolution
U1  - 575 
PY  - 1969///
CY  - N carolina
PB  - University Of North Carolina Press
N1  - G. Ledyard Stebbins: Basis of progressive evolution.  N carolina.  University Of North Carolina Press, 1969.--(575STE)
ER  -