Aging and levels of biological organization / edited by Austin M. Brues and George A. Sacher. Brues, Austin M. ed. Sacher, George A., joint ed. American Institute of Biological Sciences. Aging Congresses. Longevity Congresses. QP84 .B68 575.1 BRA "Proceedings of a conference at Princeton, New Jersey, December 2-5, 1962." "Sponsored by the American Institute of Biological Sciences and supported by the National Heart Institute, National Institutes of Health." Includes bibliographical references and index. Chicago : University of Chicago Press, 1965. 1965. 1965 Text xi, 353 p. : eng