In what month and year did construction begin on St. Louis's Gateway Arch?
February of 1963
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1869
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1869
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1869
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1870
1869
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1872
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1889
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1870
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1872
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1883
1855
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1889
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1896
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1870
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1871
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1890
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1872
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1883
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1855
1889
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1867
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