523,864 BIRTH Birth defects. Proceedings of the Fourth International Conference Vienna, Austria, 2-8 September, 1973. Sponsored by the National Foundation-March of Dimes and organized by International Medical Congres Ltd. Ed. Arno G. Motulsky, W. Lenz. Co-ed. F. J. G. Ebling. Amsterdam 1974 Excerpta Medica, New York, American Elsevier Publishing Co., Inc. 8° s. XVIII, 373, ilustr. Excerpta Medica. International Congress Ser. No. 310.