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Published since 1935, H.E. Harris' International Award Winning Catalog contains current market prices for United States, U.S. Possessions and Trust Territories, Canada and Provinces, and all United Nations. Thousands of stamp illustrations to identify virtually every design. Listed by Scott's numbering system. Includes U.S. Commemorative index and stamp identifier, grading criteria and more. Hardbound Hidden Spiral. 380 Full-Color Pages. Thousands of Price Changes.