The only known and confirmed photograph of Lincoln at Gettysburg was taken by David Bachrach. It was identified in the Mathew Brady collection of photographic plates in 1952. Lincoln's speech was short, but he and others sat for hours during the rest of the program. Because Everett's speech was very long, and because it took a long time for 19th century photographers to prepare for taking a picture, it is likely that photographers were not prepared for how short Lincoln's speech was. In 2006, John Richter identified two more photographs in the Library of Congress collection.