Nautical time 1970-01-01
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Navajo meridian and baseline 1970-01-01
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Principal meridian 1970-01-01
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Principal meridians of Alaska 1970-01-01
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Second principal meridian 1970-01-01
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Sixth principal meridian 1970-01-01
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Third principal meridian 1970-01-01
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Treaty of Tordesillas 1970-01-01
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Treaty of Zaragoza 1970-01-01
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Washington meridians 1970-01-01
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