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Keystone
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==Other uses== * [[Keystone (limestone)]], quarried in the Florida Keys * [[Keystone effect]], caused by projecting an image onto a surface at an angle, or by photography at an angle * [[Keystone Initiative]], a medical protocol to reduce infection rates * [[Keystone module]], a type of data connector mounted in walls and patch panels * [[Keystone Press Awards]] * [[Keystone species]], species that have a larger effect on their environment than is purely due to their abundance * [[Operation Keystone]], during World War II * Keystone, a variety of [[screwdriver]] blade * "Keystone", a descriptive reference to the [[Book of Mormon]] *''The Keystone'', journal of the [[Pennsylvania Railroad Technical and Historical Society]] *''The Keystone'', Pennsylvania news website owned by [[Courier Newsroom]]
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