- Structural elements, typically curved, spanning openings and transmitting vertical loads to either side of the opening; also, structural elements or freestanding structures that resemble arches or act structurally like arches.
- Structures spanning and providing passage over waterways, topographic depressions, transportation routes, or similar circulation barriers.
- Prints made from an etched printing plate, which is a metal plate on which a design is made by coating the plate with an acid-resistant substance, creating a design in the coating, and then exposing the plate to acid, which etches the plate where the metal is exposed. For designs incised directly into a copper plate using a burin or graver, use "engravings (prints)."
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Dimensions: 5.25 x 6.5 in. (13.335 x 16.51 cm)
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