[Lincoln's Gettysburg Address, Gettysburg]

Photo is a reprint of a small detail of a photo showing the crowd gathered for the dedication of the Soldiers' National Cemetery in Gettysburg, Penn., where President Abraham Lincoln gave his now famous speech, the Gettysburg Address. Lincoln is visible facing the crowd, not wearing a hat, about an inch below the third flag from the left. Josephine Cobb first found Lincoln's face while working with a glass plate negative at the National Archives in 1952. (Source: NARA, Rare Photo of Lincoln at Gettysburg, http://blogs.archives.gov/prologue/?p=2564)
Original photo is at the National Archives. The Library has a print of the whole photo in LOT 4167-A, no. 21.
Photographer attributions vary from unidentified (William Frassanito) to Mathew Brady (NARA) and David Bachrach (Center for Civil War Photography).