Shartle, Carroll L. Occupational information : its development and application / Carroll L. Shartle. - 2nd ed. - New York : Prentice-Hall, c 1957. - xvi, 384 p. : ill. ; 24 cm. Included index. 336 336 Subjects--Topical Terms: Occupations. Dewey Class. No.: 331.7 / S24o