Clam Chowder with shells

4 slices bacon , chopped 3 (6 1/2 ounce) cans whole shelled clams 3 tablespoons butter or 3 tablespoons margarine 1/2 cup chopped celery 1/2 cup chopped onion[...]

2 cups chopped potatoes 1/4 cup chopped onion 2 (7 1/2 ounce) cans minced clams 2 tablespoons butter 2 tablespoons snipped parsley 4 teaspoons flour 1/4[...]