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1
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1
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2
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Birth intervals. / https://id.loc.gov/authorities/subjects/sh85014386
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1989
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1
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3
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Birth intervals -- United States -- Statistics. / https://id.loc.gov/authorities/subjects/sh85014386 https://id.loc.gov/authorities/names/n78095330-781 https://id.loc.gov/authorities/subjects/sh99001414 : Spratley, Ernell.
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1981
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1
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