==See also==* – March 8, 1926* Abraham Lincoln's patent* Lincoln family tree==References====Sources====External links==* Robert Todd Lincoln* Photographs of Robert Todd Lincoln*Original Letters and Manuscripts: Robert Todd Lincoln Shapell Manuscript Foundation* Robert Todd Lincoln Rescued from Death by Brother of John Wilkes Booth* Robert Todd Lincoln Biography* Hildene* Glenwood School for Boys & Girls* Image of Robert Lincoln from "1888 Presidential Possibilities" card set t207.com* Robert Todd Lincoln's Biography in "Secretaries of War and Secretaries of the Army" a publication of the United States Army Center of Military History* Robert Todd Lincoln Attends Dedication of His Father’s Memorial (1922)
* Robert Todd Lincoln* Photographs of Robert Todd Lincoln* Robert Todd Lincoln Rescued from Death by Brother of John Wilkes Booth* Robert Todd Lincoln Biography* Hildene* Glenwood School for Boys & Girls* Image of Robert Lincoln from «1888 Presidential Possibilities» card set t207.com* Rober Todd Lincoln’s Biography in "Secretaries of War and Secretaries of the Army" a publication of the United States Army Center of Military History