704.749 704.750 BERG J.M. /red./ Proceedings of the Third Congress of the International Association for the Scientific Study of Mental Deficiency. The Hague,4th-12th September, 1973. Netherlands Congress Centre, Warsaw 1975 Pol, Med, Publ. 8° Vol. 2. Memorial Session 11th September 1973 to the late Professor L/ionel/ S/harples/ Penrose.Ed. with the co-operation or: J.M. Berg /i in./ .s. X, nlb. 2,100, ilustr.