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Stir flour, baking soda and salt; set aside.
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In a medium bowl, cream together the butter and sugar.
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Beat in the eggs, one at time.
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Stir in the vanilla and buttermilk alternately with the dry ingredients.
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Cover dough and chill several hours.
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Preheat oven to 400 degrees F.
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Grease cookie sheets.
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Drop dough by teaspoonfuls onto cookie sheets, about 2 inches apart.
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Combine the Cinnamon and sugar, sprinkle onto each cookie.
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Bake for 8 to 10 minutes until golden brown.
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Remove from baking sheets to cool on wire racks.