EXCERPTA MEDICA INTERNATIONAL CONGRESS SERIES, No. 284 523,750 Advances in voluntary sterilization.Proceedings of the Second International Conference Geneva, Switzerland February 25-March 1, 1973. Ed. by Marilyn E. Schima /i in./. Amsterdam 1974 Excerpta Medica,New York, American Elsevier Publishing Company, Inc. 8° s. nlb. 16, 515, ilustr. Excerpta Medica,International Congress Ser. no. 284.