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The Automobile Association introduced road signs in 1908.
UMG23A61_383

The Automobile Association introduced road signs i...

Railroad Crossing Signs
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Railroad Crossing Signs

Staten Island Ferry boat
UMG23A55_399

Staten Island Ferry boat

Denial of Service Sign on Door
UMG22A53_384

Denial of Service Sign on Door

Anti-Hijacking Warning at National Airport
UMG22A53_412

Anti-Hijacking Warning at National Airport

A sign advises beachgoers to avoid disturbing marine wildlife after an unusual number of ill or deceased marine wildlife washed up on Ventura and Santa Barbara county beaches
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A sign advises beachgoers to avoid disturbing mari...

Aviators at Bolling Field, standing in front of a Hadley Page plane on polo grounds, with an obvious warning sign ca. between 1909 and 1932
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Aviators at Bolling Field, standing in front of a ...

Airport Security Sign
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Airport Security Sign

Italy, Pompeii
UMG20B25_233

Italy, Pompeii

A sign warning of radiation and forbidding entry into the 30 km perimeter established around the site of the 1986 chernobyl nuclear accident, may 1998.
UMG20B06_257

A sign warning of radiation and forbidding entry i...

Measles
UMG20A50_146

Measles