- Signaling devices (e.g., fire, smoke, blinker, semaphore)
- Signal codes (e.g., drum language, flag codes, Morse code)
- Cryptography; use of carrier birds and animals
- Messengers and courier systems, etc.
- Oral communication 191
- Railway signaling systems 496
- Travel 484
- Embassies 648
- Post and relay stations 495
- Scouts in warfare 726
Outline of Cultural Materials. George P. Murdock, et al., eds. New Haven, Conn. Human Relations Area Files, Inc. 1961. xxv, 164 p.