"Gettysburg National Military Park (Pa.)" . . . "Pictorial works" . . "Tours" . . "Gettysburg : then and now : touring the battlefield with old photos, 1863-1889" . . . . . . "This tour of historic sites on the Gettysburg battlefield and surrounding area offers both a glimpse into the past as well as modern views of each photographic site." . . . . "1863" . .