United States

U.S. Stamp Identification – Image or Number : The Swedish Tiger – Roger Kirby
This is a great site that provides tons of information on identifying and valuing US, including BOB, Possessions, etc.

Linn’s Stamp News

USPS

Buy Local

Hipstamp

Ebay – With CAUTION

Inherited Collections – What to do?

Removing Stamps – Gum or Self-Adhesive

Watermarking

Value: Catalog v. Market

Future of Philately

Glossary

Auctions