This series consists of letters, autographs, and miscellaneous other documents that were not originally directed to Harrison or his family, but which Harrison collected. There are items from many famous people, most of whom were Americans, including John Quincy Adams, Washington Irving, Thomas Jefferson, Abraham Lincoln, Henry Wadsworth Longfellow, George Washington, and Noah Webster. The content of the letters in this series tends to not be very substantive, with many of the letters being things such as thank you notes, responses to requests for autographs, and invitations and responses to invitations.