An act of Congress signed by Thomas Jefferson in 1791 declaring Vermont as the 14th state to join the union is up for auction.

Officials say it's one of 28 printed copies that were made for the 13 original colonies and Vermont. Before statehood, Vermont was a republic known for its fierce independence.

The item, along with half dozen other historical documents related to Vermont, will be auctioned off by Swann Auction Galleries in New York in its autograph auction on Thursday.

Swann estimates its worth between $15,000 and $25,000.

The Vermont Historical Society already has its own copy of the document.

The items to be auctioned can be previewed online at the Swann Galleries website.

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Online:

http://www.swanngalleries.com/