Previous ed. Published in 24 vols. as "Encyclopaedia Britanica." 1970. micropaedia and macropaedia are numbered by the publisher v.1-19 respective 15th ed. by differs in content
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v. 1.-12 Micropaedia : Redy Reference and index.--v.13-29 Macropaedia : Knowledge in Depth.--v.30. Propaedia : outline of Knowledge and guide to the Britannica. The Micropaedia in turn is suggested readings in the propaedia, in 2 v. : A-K, L-Z