Ah, Stamp Dealers - what can you say? There are so many... Well, I decided to let postal authorities lead the way.
And here's a couple of books to consider...
|Top Dollar Paid : The Complete Guide to Selling Your Stamps - by Stephen R. Datz
A review: "I bought this book to get a stamp dealers viewpoint of stamps and collecting. I had no idea the book would be so enjoyable. Lots of interesting stories made the pages fly by as I was learning strategies and techniques about buying and selling stamps.
It really humanizes stamp dealers."
|Affordable Foreign Errors : On Postage Stamps of the World by Paul S. Greenlaw, Martin Sellinger (Editor)
..shows collectors how to invest in the growing foreign stamp market, too, featuring in-depth descriptions of more than 5,000 foreign errors prices at $200 or less. 500+ photos ...