d2dd4b77___Stamp_Collecting_Accessories__Description
[Accessory] Stock Book, Sheets, and Cards [Price Range] Varies [Description] 
Stock books consist of pockets made of clear-plastic or paper into which stamps can be inserted and stored. The plastic ones have the advantage that the entire stamp is visible as in an album page. Collectors use them primarily to store duplicates and/or varieties. Individual sheets called stock sheets and a smaller variety called stock cards are also available to store stamps.
One Family's Blog: Stamp Collecting Accessories
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