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Wärmetauscher-Entwurf; Blueprint-Raum; Photostat; Aktengewölbe, Zeichn...
Public domain scan of drawing related to architecture design, elements of decor, free to use, no copyright restrictions image - Picryl description
[Negative photostat of] Trow map, south of 110th St.
Picryl description: Public domain image of an old city plan, vintage cartography, 18th-19th century map, free to use, no copyright restrictions.