Sixth edition, with supplement of the 1970s.
New York: Thomas Y. Crowell, (1972).
Thick octavo, cloth, dust jacket (a little rubbed at spine ends and folds, with one small tear, and some loss of pigment). Near fine.
Logically organized volume which includes not just the facts and dates, but the surrounding information. Learn the answers to such questions as "When was the first radio program broadcast?" (December 24, 1906, from Brant Rock, Mass. It was a private broadcast of an experimental program).