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Computability, Complexity, and Languages
註釋The take-it-with-you collecting resource?



At last, a guide you can really carry along to estate sales, garage sales, and flea markets, containing 1,000 color photographs and current pricing to make on-the-spot appraisals easy.





  • New to this edition! Feature chapters on Christmas stamps and Error stamps




  • 1,000 detailed color photos




  • Listings for all 4,250+ U.S. regular-issue and Airmail stamps from 1847-2010




  • Accurate prices in Unused and Used condition




  • State-of-the-market report and advice on beginning a collection, including where to find stamps, judging quality, grading, and handling and storage