The Book of Knowledge Annual 1960. The Grolier Society.
For an interesting look at how the Glennn L. Martin Company made this rocket in Denver, Colorado, read Making the Titan. Convair was already building the SM-65 Atlas in La Jolla, California. Martin got the contract in 1956, because the U.S. Air Force decided that a second, different approach to constructing these weapons would be useful.