TY - BOOK A1 - Ropp, R. S. de T1 - Man against aging, New York (Grove Press) 1962. Y1 - 1962 ER - TY - JOUR A1 - Ropp, R. S. de T1 - Drugs, Yoga, and Psychotransformism JF - J. Needleman and D. Lewis (Eds.), On the Way to Self Knowledge, New York (Alfred A. Knopf) 1976, pp. 148-181. Y1 - 1976 ER -