United States Post Offices Volume 7 The Lower Mississippi Valley
By Richard Helbock
Published: April 4, 2010.
The seventh volume in a set of eight that comprises an alphabetical listing of the over 166,000 post offices that have ever operated in the 50 United states from 1776 to date. The listing for each office contains a county location, dates of operation and a Scarcity Index (S/I) value that offers postmark collectors with a guide to the relative value of postmarks from that post office.