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Preheat oven to 350ºF.
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Grease 2 8x4-inch loaf pans.
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In a mixing bowl, stir together flour, baking powder, baking soda, and salt; set aside.
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In a large mixer bowl cream together the 1 cup sugar and shortening till light and fluffy.
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Add eggs and vanilla; beat well.
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Blend in sour cream and milk.
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Add flour mixture to sour cream mixture; mix well.
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Spread 1/4 of the batter in each of the greased loaf pans.
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Combine the topping ingredients and sprinkle 1 Tbs. of this mixture over the batter in the pans.
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Top each with half of the remaining batter.
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Cut through batter gently with a knife to make a swirling effect with the cinnamon.
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Sprinkle the remaining of the topping mixture on top of the loaves.
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Bake for 35-40 minute Cool in pans for 10 minute Remove from pans, cool thoroughly on wire racks.