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Amazon.com: Paul Rubens Watercolor Block, Artist Quality Watercolor Paper 7.6 x 5.3 Inches, 140-lb Acid-Free Cold Pressed Paper Pad, 50 Percent Cotton Rag, 20 Sheets
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Amazon.com: Arches Watercolor Block 9x12-inch Natural White 100% Cotton Paper 2-Pack - 40 Sheets of Arches Watercolor Paper 140 lb Cold Press - Arches Art Paper for Watercolor Gouache Ink Acrylic and More
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