LEADER 00000nam 2200217 a 4500 001 0755855 003 UkHlHU 007 t 008 001204 4 1971 000 eng 040 UkHlHU 050 4 BF 723 T9 M6 100 0 Mittler, Peter J. 245 04 The study of twins. 260 Harmondsworth :|bPenguin,|c1971. 300 192p. 440 0 Penguin science of behaviour 650 0 Genetic psychology. 650 0 Child psychology. 946 020 absent -- ISBN check required
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