(Basford, Leslie; Chief Editor). UNDERSTANDING SCIENCE. 12 vols., 4to; pp. in total 2168, each volume numbered consecutively, and each with 8 pages of preliminaries including Contents and Index, Volume 12 with 16-page Classified Contents and Consolidated Index for the whole work; very numerous coloured illustrations; original buckram (some vols. slightly marked); a fine set in dustwrappers. (London); Sampson Low; (1962-65).