The early printings of Abraham Lincoln's Gettysburg Address and what they reveal about his spoken words

"A study of the early printed versions of U.S. president Abraham Lincoln's 1863 Gettysburg Address as found in newspapers, pamphlets, and broadsides, in order to determine his spoken words at the actual dedication ceremony. With 17 illustrations, a select bibliography, and an annotated checklist of early printings" --Provided by Publisher.