File:First US Stamps 1847 Issue.jpg - Wikipedia

Postage stamps and postal history of the United States - Wikipedia

1 - 1847 5c Benjamin Franklin, red-brown, thin bluish wove paper, imperforate - Mystic Stamp Company

Robert A. Siegel Auction Galleries, Inc. Sale - 993 Page 2

Flora & Fauna Issue (1988-2001)

Women on US stamps - Wikipedia

File:Stamp US 1847 10c.jpg - Wikipedia

U s postage stamp hi-res stock photography and images - Alamy

Postage stamps and postal history of the United States - Wikipedia

Stamps auction catalogue: World rarities & important collections 2011 by David Feldman - Issuu