| http://www.w3.org/ns/prov#value | - Today so many collectibles are out of reach to kids, or for that matter adults by nature of their cost, or just their ability to find them. (Look at what has happened to sports memorabilia in the past 10 years.) Postal covers are for the most part pretty inexpensive and there is not a country or state that you can not go to and find something unique.
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