Second Bureau Issues (1902-1908)

US Stamps - General Issues of 1902-1908

300-13 - Complete Set, 1902-03 Series (Second Bureau Series) - Mystic Stamp Company

US Stamps - General Issues of 1908-1910

Third Bureau Issues (1908-1922)

Postage stamps and postal history of the United States - Wikipedia

Adolph S. Ochs Issue National Postal Museum

Second Bureau Issues (1902-1908) National Postal Museum, 40% OFF

Postal Note Stamps National Postal Museum

Second Bureau Issues (1902-1908) National Postal Museum, 45% OFF