The New Encyclopaedia Britannica Macropaedia Vols 1 - 19, Micropaedia Vols I - X, 5 Year Books 1985-1989, 4 Science And The Future, 1986-1989, 3 Medical And Health, 1987-1989 + Guide To The Britannica Total of 41 Volumes.
Encyclopaedia Britannica Inc.