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Soft cover. Softcovers; comb-bound; ex-library; minor shelfwear; missing one plastic tooth on binding; o/w in very good condition.

Soft Cover. Zustand: Good. Softcovers; comb-bound; ex-library; ALSO INCLUDES 7-page stapled field trip route guide loosely inserted; front wrap w/ small hole along upper edge; minor shelfwear; stapled guide w/ creased edges; o/w in good condition.

Soft Cover. Zustand: Very Good. Softcovers; comb-bound; ex-library; small stain on front wrap; minor shelfwear; o/w in very good condition.

Softcover. Zustand: Very good. Francisco Toledo (illustrator). First Edition. AMA (Automatic Message Accounting), computerized telephone call accounting articles reprinted from Bell Laboratories Record, ca 1953. Automatic message accounting (AMA) provides detailed accounting for telephone calls. When direct distance dialing (DDD) was introduced in the US, message registers no longer sufficed for dialed telephone calls. The need to record the time and phone number of each long-distance call was met by electromechanical data processing equipment. Articleas include: "Code Patterns in Telephone Switching and Accounting Systems" by J.W. Dehn; "The AMA Tape Perforator" by P.B. Drake; "The AMA Assembler" by Glen C. Drew; "The AMA Computer" by A.E. Hague; "Tape-to-Card" Converter" by W.B. Groth; and much more. 138 pages. Halftones, diagrams, Pictorial stiff paper, spiral binding. Triffle rubbed. "WW Brown 1954" top right corner of the title page. 10" - 7". book.