My recent post about the Thomas Hales Collection of Civil War Patriotic Envelopes at the Postal History Foundation of Tucson, Arizona reminded me of a collection of Civil War envelopes at the Library Company of Philadelphia. That collection of Civil War envelopes is part of the John A. McAllister Collection of Civil War Era Printed Ephemera, Graphics, and Manuscripts. It consists of about 7,000 patriotic envelopes. As with the Thomas Hales Collection, most of the envelopes in the McAllister Collection are representative of the Union side of the Civil War. A collection of around 300 of the envelopes are displayed as part of the Library Company’s online digital collection. The documentation of the McAllister Collection envelopes also makes use of William R. Weiss’ The Catalog of Union Civil War Patriotic Covers (Bethleham, Pa.: William R. Weiss, 1995). The Library Company of Philadelphia is the library founded by Benjamin Franklin in 1731.