New York, N.Y. Bell Telephone Laboratories, Incorporated March 1951. First Separate Edition. 15, [1-blank] pages. 10 7/8 x 8 3/8 inches (275 x 213 mm). Publisher's printed grey, blue and black wrappers. Stapled, with five holes punched at the spine as issued. One of two variants known, this example printed..... More