RT Book T1 Twin research: proceedings of the 2. International Congress on Twin Studies Aug. 29 - Sept. 1, 1977 Washington, D.C. T2 Progress in clinical and biological research A2 Nance, Walter E. LA English PP New York PB Liss YR 1978 UL https://krimdok.uni-tuebingen.de/Record/1077507577 CN 618.2/5 SN 0-8451-0024-6 K1 Konferenzschrift