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North Korea's Natural Resources
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Soroban, or Japanese Abacus | National Museum of American History
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Abacus - Wikipedia
Abacus, Suan Pan, Tschu Pan, Schoty, Soroban (Counting Beads, Counting Frame)
Antique Japanese Abacus Professional 126 Wooden Bead 21 Decimal Soroba – Shogun's Gallery
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Abacus, Hobbies & Toys, Stationery & Craft, Stationery & School Supplies on Carousell
