Whether you collect them or still use them to send mail, the postage stamp has had an interesting history.
Provenance and Owner Markings - Confederate Postal History
Plate Blocks/Multiples, United States, Stamps - PicClick UK
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R164 - 1898 2c US Internal Revenue Stamp -Battleship, carmine rose
History of the Postage Stamp
PDF) Pushing the prison doors open: Snail mail and the resistance of the postal system
Empire State Postal History Society
Auction, Collectibles Auction, Original Historical Documents - Cohasco DPC
Newman Numismatic Portal at Washington University in St. Louis
History of the Postage Stamp - from 1842 to the present - RFD-TV
History of the Postage Stamp - from 1842 to the present - The Cowboy Channel
The Story of the First Postage Stamp, Arts & Culture
All Aboard the Sweetheart Express - Prag collection est-Railroad collection est-Ken prag collection
The history of airmail in the United States - RFD-TV
Inventor of postage stamp hi-res stock photography and images - Alamy
History of the Postage Stamp - from 1842 to the present - The Cowboy Channel