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Police officer speaking to demonstrator during civil disobedience action
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Abandoned bridge pier at Harpers Ferry, at night [01]
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Abandoned bridge pier at Harpers Ferry, at night [02]
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Abandoned bridge pier at Harpers Ferry, at night [03]
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Abandoned bridge pier at Harpers Ferry, at night [04]
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Abandoned bridge pier at Harpers Ferry, at night [05]
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Abandoned bridge pier at Harpers Ferry, at night [06]
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Abandoned bridge piers at Harpers Ferry [01]
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Abandoned bridge piers at Harpers Ferry [02]
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Abandoned bridge piers at Harpers Ferry [03]
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Abandoned bridge piers at Harpers Ferry [04]
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Abandoned bridge piers at Harpers Ferry
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Thunderbolt siren in Jessup Park [08]
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Thunderbolt siren in Jessup Park [07]
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Thunderbolt siren in Jessup Park [06]
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Thunderbolt siren in Jessup Park [05]
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Thunderbolt siren in Jessup Park [04]
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Thunderbolt siren in Jessup Park [03]
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Thunderbolt siren in Jessup Park [02]
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Thunderbolt siren in Jessup Park [01]
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4th Maine Infantry memorial [01]
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4th Maine Infantry memorial [02]
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4th Maine Infantry memorial [03]
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4th Maine Infantry memorial [04]
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4th Maine Infantry memorial [05]
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4th Maine Infantry memorial [06]
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4th Maine Infantry memorial [07]
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4th Maine Infantry memorial [08]
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Siren at Jefferson Volunteer Fire Company [01]
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Siren at Jefferson Volunteer Fire Company [02]
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Siren at Myersville fire department
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Thunderbolt siren on Waterloo Road [09]
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Thunderbolt siren on Waterloo Road [08]
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Thunderbolt siren on Waterloo Road [07]
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Thunderbolt siren on Waterloo Road [04]
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Thunderbolt siren in Jessup Park [10]
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Thunderbolt siren in Jessup Park [09]
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Thunderbolt siren on Waterloo Road [17]
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Thunderbolt siren on Waterloo Road [06]
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Thunderbolt siren in Jessup Park [14]
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Thunderbolt siren in Jessup Park [13]
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Thunderbolt siren in Jessup Park [12]
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Thunderbolt siren on Waterloo Road [14]
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Thunderbolt siren on Waterloo Road [03]
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Thunderbolt siren on Waterloo Road [02]
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Thunderbolt siren on Waterloo Road [05]
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Thunderbolt siren in Jessup Park [11]
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Thunderbolt siren on Waterloo Road [13]
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Thunderbolt siren on Waterloo Road [01]
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Thunderbolt siren on Waterloo Road [16]
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Thunderbolt siren on Waterloo Road [15]
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Thunderbolt siren on Waterloo Road [12]
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Thunderbolt siren on Waterloo Road [11]
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Thunderbolt siren on Waterloo Road [10]
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Federal Signal Model 2 siren at Verona Fire Department [03]
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Federal Signal Model 2 siren at Verona Fire Department [02]
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Federal Signal Model 2 siren at Verona Fire Department [01]
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Siren on Eastwick Library in Philadelphia [01]
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Siren on Eastwick Library in Philadelphia [02]
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Siren on Eastwick Library in Philadelphia [03]
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Siren on Eastwick Library in Philadelphia [04]
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Siren on Eastwick Library in Philadelphia [05]
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Federal Signal Modulator in Atlantic City [01]
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Federal Signal Modulator in Atlantic City [02]
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Federal Signal Modulator in Atlantic City [03]
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Federal Signal Modulator in Atlantic City [04]
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Siren at Warrenton Volunteer Fire Company
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Siren at Stuarts Draft Volunteer Fire Department [03]
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Siren at Stuarts Draft Volunteer Fire Department [01]
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Siren at Stuarts Draft Volunteer Fire Department [02]
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Federal Signal Model 5 siren in Lucketts, Virginia [01]
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Allertor siren in Lucketts, Virginia [02]
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Allertor siren in Lucketts, Virginia [01]
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Allertor siren in Lucketts, Virginia [03]
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Federal Signal Model 5 siren in Lucketts, Virginia [02]
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Siren at United Steam Fire Engine Company #3
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Siren at Fairfield Fire & EMS [01]
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Siren at Fairfield Fire & EMS [02]
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Sirens at Gaithersburg Fire Museum
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Flood warning system in downtown Ellicott City [02]