X Twenty-fourth letter of the alphabet. A cross on its side. A variable common to algebraic equations and higher mathematics. A prefix of the English language. A Motion Picture Association of America rating for adults-only movies. A type of chromosome. An axis in a three-dimensional system. A viral encephalitis. A measure of the height of a printed letter. An unknown quantity. An American rock 'n' roll band.
Edited by f Stop Fitzgerald
Text by Chris Morris
Paperback, 64 pages, 8.5 x 11, black and white photos/illustrations throughout.
Published in 1983 by Last Gasp