Hays Army Ammunition Plant was established in 1942 in the Hays neighborhood of Pittsburgh, Pennsylvania. At first it produced gun forgings for the U.S. Navy. Later, it produced 16 inches (410 mm) ammunition for naval guns. The site comprised five buildings on a 7.9-acre (3.2 ha) site. Though owned by the Army, the plant was operated by the Mesta Machine Company on behalf of the U.S. Navy during World War II. The plant was operated by the Mullins Manufacturing Company during the Korean War., and by the Levinson Steel Company during the Vietnam War. The plant was placed on standby in 1991 and donated for redevelopment in 1993. It is presently used as an industrial site.
- "Galvtech (Hays Ammunition Plant)". Western Pennsylvania Brownfields Center. Carnegie-Mellon University. http://www.cmu.edu/steinbrenner/brownfields/Case%20Studies/pdf/galvtech%20-%20hays%20ammunition%20plant.pdf. Retrieved 27 January 2014.
- Ferguson, Robert; MacDonald, Stuart E. (1984). "Hays Army Ammunition Plant". Washington, D.C.: Library of Congress. http://lcweb2.loc.gov/pnp/habshaer/pa/pa1700/pa1754/data/pa1754data.pdf. Retrieved 27 January 2014.
- Historic American Engineering Record (HAER) No. PA-77, "Hays Army Ammunition Plant, 300 Mifflin Road, Pittsburgh, Allegheny County, PA", 46 data pages
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