The United States Postal Guide

Iron Age Ads: With post offices often being run out of the town's general store, advertising in postal guides.

1885edition.jpg
In this ad from the 1885 edition of the U.S. Official Postal Guide, the Chicago Scale Co. invited postmasters to distribute promotional materials at the post office, and extended the same discount given to wholesale dealers for doing so. Additional compensation would be paid for lists of local farmers.