- Refers to the context of or associated specifically with the modern political entity of the United States of America.
- Man-made conduits for carrying water over long distances, usually by means of gravity, particularly structures that include channels and elevated sections on bridgelike structures, optimized by the Romans and based on inventions of earlier cultures. The term derives from Latin aqua, meaning "water," and ducere, meaning "to lead." In modern engineering, the term refers to any system of pipes, ditches, canals, tunnels, and supporting structures used to convey water from its source to its main distribution point.
- Structures spanning and providing passage over waterways, topographic depressions, transportation routes, or similar circulation barriers.
gelatin silver prints
- Refers to photographic prints having gelatin as the binder, holding silver as the final image material; always black-and-white, though they may be toned to a monochrome hue.
- Refers to the culture of the modern nation of Spain, or in general to the cultures that developed on the Iberian Peninsula in southwestern Europe.
- Creative works that depict settlements that may be considered towns or villages. For creative works depicting settlements that may be considered cities, use "cityscapes." For images that seem more documentary than creative, prefer "views." To designate the actual built forms of towns or cities as perceived visually and aesthetically, use "townscapes (built environment)."
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