RT Book T1 Twin research / b Biology and epidemiology T2 Progress in clinical and biological research JF Twin research proceedings of the 2. International Congress on Twin Studies Aug. 29 - Sept. 1, 1977 Washington, D.C. LA English PP New York PB Liss YR 1978 UL https://krimdok.uni-tuebingen.de/Record/1077507593 SN 084510151X