Investigation of digital data communications system.

Vol. 2 by Harold D. Becker and John G. Lawton.

Study of satellite frequency requirements for the U.S. Postal Service electronic mail system /

v.1 Summary -- v. 2. Frequency allocations and network designs -- v.3 Technology studies

National Communications System : thirty years of progress.

Shipping list no.: 93-0509-P.

The Bell System technical journal

Mode of access: Internet.

Organizational maintenance manual : communications relay group, guided missile system, truck mounted, AN/MRC-137.

Includes index.

Operators, organizational, direct support, and general support maintenance manual, including repair parts and special tools list (including depot maintenance repair parts and special tools list) : 48-volt battery system.

Includes index.