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Photograph of an Indicator Board for Regulating Temperature
Historic Photograph File of National Archives Events and Personnel Public domain photograph related to history of the US National Archives, free to use, no copyright restrictions image - Picryl description
Photograph of an Indicator Board for Regulating Temperature
Historic Photograph File of National Archives Events and Personnel Public domain photograph related to history of the US National Archives, free to use, no copyright restrictions image - Picryl description