Pumpkin Bars

2 cups sifted flour
2 tsp. Baking powder
2 tsp. cinnamon
1 tsp. baking soda
4 eggs
2 cups canned pumpkin
1 2/3 cups sugar
1 cup vegetable oil
1 cup chopped pecans

Mix together oil, sugar and eggs.  Add the pumpkin and mix well.  Sift together all the dry ingredients.  Add part of the dry ingredients to the oil mixture, and then slowly add the rest of the dry ingredients and stir until just moistened.  Spread in a 15"x10"x1" pan.  Bake at 350° for 25-30