The New Encyclopaedia Britannica.-
- 15th ed.-
- Chicago : Encyclopaedia Britannica, c1981.
- 30 v. : ill. (some col.) ; 29 cm.
Spine title: Encyclopaedia Britannica.
Includes bibliographies.
Propaedia: outline of knowledge and guide to the Britannica. 1 v. -- Micropaedia: ready reference and index. 10 v. -- Macropaedia: knowledge in depth. 19 v.