Ruggles, Richard National income accounts and income analysis / Richard Ruggles & Nancy D. Ruggles - 2nd. ed. - New York : McGraw-Hill , 1956 - viii, 452p. : ill. ; 24 cm. Includes index. Subjects--Topical Terms: National income accountingIncome--United States Dewey Class. No.: 339.3 / RUG