Bake at 375 degrees for 12 to 15 minutes. Makes 5 dozen cookies. Sift together flour, soda and salt. Cream butter. Gradually add sugar, creaming well. Add eggs, beat well. Blend in dry ingredients. Stir in ground oats, ground raisins, and chopped nuts. Shape into balls, using a rounded teaspoonful for each. Place on ungreased baking sheets; flatten slightly with bottom of glass dipped in flour. Bake in moderate oven (375 degrees) 12 to 15 minutes. *For use with Pillsbury's Best Self-Rising Flour, omit salt and soda.