Whether you collect them or still use them to send mail, the postage stamp has had an interesting history.
The Lake City reporter and Columbia gazette
1920s Full Sheet 15 Unused Vintage US Postage Stamps 32-c Celebrate the Century Roaring Twenties Jazz Radio Save the Date Wedding Postage
Newman Numismatic Portal at Washington University in St. Louis
Timeline of Philatelic Literature, 1830 - 1875
History of the Postage Stamp - from 1842 to the present - RFD-TV
Provenance and Owner Markings - Confederate Postal History
Plate Blocks/Multiples, United States, Stamps - PicClick UK
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R243 - 1933 $4 US Internal Revenue Stamp - engraved, yellow brown
Stamp-ede! - True West Magazine
History of the Postage Stamp - from 1842 to the present - RFD-TV
Raymond Ostrander Smith - Linda Hall Library
Stamp-ede! - True West Magazine