The Enciclopedia Americana : International edition. (New York : Americana corporation, 1967)
Vol. 21 (800 p.) : Orley to photographic telescope ; Vol. 22 (810 p.) : Photography to Pumpkin ; Vol. 23 (792 p.) : Pumps to Russellville ; Vol. 24 (824 p.) : Russian to Silius ; Vol. 25 (824 p.) : Silk to sulphovinic acid ; Vol. 26 (761 p.) : Sulphhur to tramways, aerial ; Vol. 27 (954 p.) : Trance to venial sin ; Vol. 28 (807 p.) : Venice to Wilmot, John ; Vol. 29 (827 p.) : Wilmot proviso to zygote ; Vol. 30 (966 p.) : index
Keywords: Encyclopedia