Title: Very Helpful...but only buy the spiral bound version
Review: Great quick reference book (and cheaper than Scotts Catalogue)...but the spiral version has two big advantages in my mind1) You can tear out the pages that you don't need to make the book smaller and easier to use. For example I remove the United Nations, 1st day cover, famous autographs, duck stamps, Canadian trust terrritory and postal stationary sections.2) It is easier to use the book balanced on your knee while checking eBay or folded in half next to your Stamp Album.
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