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Preheat oven to 350°.
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In bowl sift together flour, baking powder, baking soda and salt.
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In large bowl with an electric mixer, cream the butters and brown sugar; beat in eggs 1 at a time.
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Beat in buttermilk. Beat mixture until it is combined well; add flour mixture.
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Beat batter just until combined. Stir in chocolate chips.
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Divide batter among 5 buttered and floured loaf pans, 5 3/4x3 1/4x 2 inches.
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Bake in middle of oven for 40 to 45 minutes, or until a toothpick comes out clean.
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Remove breads from pans; let them cool right sides up on wire rack.
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Keep bread wrapped well in plastic wrap and foil, chilled 1 week or freeze 1 month.