Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
1 1/2     cups          all-purpose flour
1/2       cup           whole wheat flour
1/2       cup           sugar
1/4       teaspoon      salt
2         tablespoons   butter or margarine -- softened
1/2       cup           milk -- up to 2/3
                        salt for the tops -- optional

Preparation:

Preheat the oven to 325. In a large bowl or in the food processor, combine the flours, sugar, and salt. Cut the butter into the flour until the mixture resembles coarse meal. Blend in the milk slowly, using only enough to form a dough that will hold together in a cohesive ball. Divide the dough into 2 equal portions for rolling. On a floured surface or pastry cloth, roll the crackers thin, 1/16 to 1/8 inch. If desired, lightly sprinkle the tops with salt and gently roll over the dough with your rolling pin. With a sharp knife, cut the crackers into 2 inch squares. Transfer them to an ungreased baking sheet. Prick each cracker in 2 or 3 places with the tines of a fork. Bake for 20 to 25 minutes, or until the crackers are lightly browned. Cool on a rack.