Encyclopedia Britannica: A New Survey of Universal Knowledge Vol. XXIII (Vase-Zygo).
Encyclopedia Britannica: A New Survey of Universal Knowledge Vol. XXIII (Vase-Zygo). - Chicago : Encyclopedia Britannica Inc., c1961. - 999p. illus (pbk) 29cm.
Encyclopedia and Dictionaries--c1961--Chicago--Paperback
Encyclopedia and Dictionaries--c1961--Chicago--Paperback