Columbia subject headings:
Harvard subject headings:
Radio frequency allocation--United States.
United States. Department of Defense--Communication systems.
United States. Department of Defense--Data processing.
Year 2000 date conversion (Computer systems)--United States
Princeton subject headings:
Radio frequency allocation--United States.
United States. Department of Defense--Communication systems.
United States. Department of Defense--Data processing.
Year 2000 date conversion (Computer systems)--United States.