Flexner, Abraham, 1866-1959; Goldman, Hetty, 1881-1972; Sachs, Paul J. (Paul Joseph), 1878-1965(Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA, 1934-1937)
Flexner, Abraham, 1866-1959; Goldman, Hetty, 1881-1972(Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA, 1938-1944)