TY - JOUR AU - , von Hahn, H. P. AB - Article PDF first page preview Close This content is only available as a PDF. © 1968 The Gerontological Society of America TI - Advances in Gerontological Research Vol. 2 JF - Journal of Gerontology DO - 10.1093/geronj/23.1.97 DA - 1968-01-01 UR - https://www.deepdyve.com/lp/oxford-university-press/advances-in-gerontological-research-vol-2-gskb59gZhn SP - 97 EP - 97 VL - 23 IS - 1 DP - DeepDyve ER -