Popkin, Richard H. (Richard Henry), 1923-2005 (Personal Name)
His The neo-intuitionist theory of mathematics and logic, 1950.
Philosophy and contemporary problems, 1984: CIP t.p. (Richard H. Popkin) data sheet (Popkin, Richard Henry, b. 1923)
Wikipedia WWW site, Oct. 5, 2006 (Richard H. Popkin; b. Dec. 27, 1923, Manhattan; d. Apr. 12, 2005, Los Angeles; historian of philosophy)
LC database, Oct. 5, 2006 (hdg.: Popkin, Richard Henry, 1923- ; usage: Richard H. Popkin)