Published by Los Angeles, California. Space Navigation Systems Navstar Global Positioning System Joint Program Office, 1986
Seller: Erik Hanson Books and Ephemera, San Diego, CA, U.S.A.
Soft cover. Condition: Very Good. 74 pages. September, 1986 Fourth Edition. Offset printed, with stiff paper covers, the illustrations are not well printed. Plastic comb binding is intact. A clean and sound copy, ruffled pages edges on a few pages, probably due to insects. Interesting vintage survivor.