Historical characters Jordan Ryan, left, and his father, Bob Ryan, depict Union signal corps officers at the re-enactment, held each American Independence Day Weekend (on and surrounding July 4), of various skirmishes at the decisive 1863 Battle of Gettysburg, in Pennsylvania, which turned the tide of the American Civil War against the outmanned, rebellious Confederates for good
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2019 07 06.
http://www.loc.gov/rr/print/res/