695992 Announcement for the Central Fair Letter Boxes, c.1864 (colour litho) by American School, (19th century); 23.2x37 cm; Gilder Lehrman Collection, New York, USA; (add.info.: Gillespie, postmistress for the Central Fair, directs Fair participants to "Letter-Boxes, as a great convenience to all desiring to correspond with visitors to the Fair; as well as for letters to be delivered throughout the City, or at the Post Office for mailing." Summarizes mailing requirements and rates. The Great Central Fair for the United States Sanitary Commission opened in June 1864 in Logan Square, Philadelphia. The Fair was held to raise funds for Union soldiers in need of basic necessities and medical supplies. Elizabeth Duane Gillespie (1821-1901) .); 穢 Gilder Lehrman Institute of American History ; American, out of copyright.