Here is a great little item. Harper and Brothers is one of the really long-lived publishers. Beginning as J. & J. Harper in 1817 and evolving into Harper and Brothers in 1833 it was one of the major 19th century publishers. Harper's Weekly was a hugely popular periodical especially during the Civil War.This little calendar from August, 1886 advertises a number of books published by Harper. Most publishers produced these little advertising pieces in this era. They are not too easy to find however.
