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Amazon.com: Stillman & Birn Gamma Series Softcover Sketchbook, 5.5" x 8.5", 150 GSM (Heavyweight), Ivory Paper, Medium Grain Surface : Arts, Crafts & Sewing
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Amazon.com: Stillman & Birn Gamma Series Hardbound Sketchbook, 9" x 6", 150 GSM (Heavyweight), Ivory Paper, Medium Grain Surface : Arts, Crafts & Sewing
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