letterformarchive, 
Apropos of nothing in particular: bird logos.
Signet Signal Symbol: Handbook of international signs by Walter Diethelm, in collaboration with Dr. Marion Diethelm, ABC Edition Zurich, 1984.
Left to right, top to bottom:
- George Giusti, Architecture and Arta Penguin list, UK
- Neil Fujita, Pelican Productions Inc., US
- Hans Hartmann, Kreidenfabrik Signa, CH
- Erwin Poell, Ullstein Verlag, DE
- Robert R. Overoy, Mitchell Travel Service, US
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