Like It or Not, Chicago's About to Get a Lot Less Orange – Chicago Magazine
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The Sodium Lamp - How it works and history
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Sodium-vapor lamp - Wikipedia
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SODIUM VAPOUR LAMP | An Architect Explains | ARCHITECTURE IDEAS
Sodium Vapor Lamp Photograph by Richard Treptow - Fine Art America
New York's Street Lamps in Flux | The New Yorker
Low Pressure Sodium Lighting - Flagstaff Dark Skies Coalition
Sodium-vapor lamp - Wikipedia
A Light at the Smithsonian – SpectroClick
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Who else is really bummed out that the sodium vapor lights will all be gone soon? : r/chicago
What is a Sodium Vapour Lamp?
Sodium Vapor Lights On College Campus Photograph by Ted Kinsman - Pixels
