TY  - BOOK
AU  - Newman,Horatio Hackett
AU  - Freeman,Frank N.
AU  - Holzinger,Karl J.
TI  - Twins : : a study of heredity and environment / 
U1  - 155.444 
PY  - 1968///
CY  - Chicago : 
PB  - The University of Chicago Press, 
KW  - Twins
KW  - Influence of environment
KW  - Heredity
KW  - Man
N1  -  Includes index
ER  -