The Use of Boston’s “Paid in Grid” Cancels: 1851-1859
by Mark Schwartz, All Rights Reserved. (single frame)
The First United States 12¢ Stamp Series of 1851 – 1861
by James Allen (8 frames)
The United States Imperforate Issues of 1851 – 1856 and Their Importance in an Expanding Postal System
by Gordon Eubanks (8 frames)
Colors of the U.S. 5¢ 1856-61 Issue and the Problem with Scott’s
by Charles “Chip” Gliedman (single frame)
United States One Cent Stamp from 1851 to 1861
by Eugene C. Reed (7 frames)
One Cent Stamp of 1851-57 (30MB)
by Roland H. Cipolla II (PDF black and white 121 pages)
The U.S. 3 Cent 1857 Issue (10MB)
by Robert R. Hegland PDF black and white 50 pages.
