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3. 2. 1. Each Cell Is Sub-Divided Into Four 15 min X 15 min Quadrants 1:50,000 charts = 15 min x 15 min. Each Cell Is 30 min x 30 min 1:100,000 charts = 30 min x 30 min. 6. 5. 4. 8. 9. 7. Each Quadrant Can Be Further Sub-divided Into Nine 5 min X 5 min Keypads. 2. 1. 3. 4.
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