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It is because Alaska is in a different time zone.

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12y ago
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2d ago

USGS cartographers created 15-minute maps for Alaska due to the larger scale of the state, its remote and rugged terrain, and the need to efficiently cover a vast area. The 15-minute maps provided a good balance between detail and coverage for the unique geographical challenges of Alaska.

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Q: Why did USGS cartographers make 15 minute maps for Alaska instead of 7.5 maps?
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