The New encyclopaedia Britannica. VOLUME 6 - 15th ed. - Chicago : Encyclopaedia Britannica, c1992. - 32 v. : ill. (some col.) ; 29 cm. Spine title: Britannica. ISBN: 0852295537 (set) LCCN: 90084190 LC Class. No.: AE5 .E363 1992 / .E363 1992 Dewey Class. No.: 031