Page 92 - Charles Shreve - William H Gross United States 1847 Issue

E. Non-Contract Steamboats Albany
1. Steamboat and Steam Markings Natchez

The mark "STEAMBOAT" or "STEAM" indicates that the letter was picked up somewhere along an inland river, lake,
bay or coastal sound by the captain or clerk of a vessel having no mail carrying contract. The captain was required by law
to carry them to a Post Office where they entered the mail stream after being marked to indicate their origin.

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AU 17, 1850 New York City, NY to Montreal, CE (August 20) via Hudson River steamboat to Albany, NY. e
The stamp has an exceptionally large top sheet margin

MR. 14, 1850 Rodney, lA to Natchez, MS. Carried on the Mississippi River Packet General Worth.
Dot in "S" variety.