Computing.- Operating and maintenance manual for the BINAC binary automatic computer built for Northrop Aircraft Corporation 1949, some light browning at edges, original grey binder with cloth back-strip and central metal device, lower bottom corner small chip, housed within later black straight-grain morocco drop-back box by P. Goy and C. Vilaine, Philadelphia, Eckert-Mauchly Computer Corp., 1949.*** The only known copy of the world's first electronic computer manual, and similarly, the only known record of how the BINAC operated. OCLC records no copies of this work in libraries, and as only one BINAC was ever built, it is likely that only a handful of copies of the manual were ever produced.