Abraham Lincoln Etiquette

Apparently there are few photos of Abraham Lincoln and none of him at Gettysburg. But now this image just popped up. A new, never-seen before photo that provides conclusive new photo-evidence of Lincoln at Gettysburg before giving his famous Address. How can this picture be anything else?And as a bonus, if you look carefully you can see the Lochness Monster behind the stagecoach (driven by Bigfoot).