United States meter stamps
| Kelsey, Douglas A. | United States, Metered mail, First days, Postal history, Covers, Cachets, Postage Dues, Official mail, Affixing machines, Vending machines, Vending Machine Franking Labels, Post office equipment, Autopost, Mailomat, Pitney Bowes, Inc., Automatic Shipping Machines, Parcel post, Mailing Facility (PPMF), PPMF, Zipster Plus | 1996 c1996. | USA : Tucson, AZ |