704.749 704.750 PROCEEDINGS Proceedings of the Third Congress of the International Association for the Scientific Study of Mental Deficiency. Netherlands Congress Centre. The Hague 4th-12th September 1973. Warsaw 1975 Pol. Med. Publ. Vol. 1. Ed. D. A. A.Primrose, s. XXIII, nlb. 1, 774, nlb. 1, ilustr.