TY  - BOOK
AU  - Peter Mittler
TI  - Study of Twins
U1  - 155.444 
PY  - 1971///
CY  - Baltimone
PB  - Penguin Books Inc
N1  - Peter Mittler: Study of Twins.  Baltimone.  Penguin Books Inc, 1971.--(155.444MIT)
ER  -