Children's Britannica. - 3rd ed. - London : Encyclopaedia Britannica, c 1973. - Vols. : ill. ; 25 cm. V. 9- Helen of Troy-Ivy ; 314 314 ISBN: 0 85229 099 3 Subjects--Topical Terms: Children's encyclopedias and dictionaries. Dewey Class. No.: 032 / C436