Hurley, Patrick M. How old is the earth? - [1st ed.] - Garden City, N.Y. Anchor Books 1959. - 160 p. illus. 19 cm. - Science study series, S5 . Includes bibliography. LCCN: 59011599 /L Subjects--Topical Terms: Geological time Subjects--Geographic Terms: Earth--Age. LC Class. No.: QE501 / .H86 Dewey Class. No.: 550.1