Russian Tea Cakes

In medium bowl, combine flour, salt and pecans; set aside. Cream butter in a large mixing bowl; gradually add 1/2 cup powdered sugar, beating until light and fluffy. Beat in vanilla. Stir in flour mixture; mixing well. Chill dough until firm. Preheat oven to 400°F (205°C) . Shape dough into 1-inch balls; place 2-inches apart on ungreased baking sheets. Bake for 12 to 15 minutes or until edges are lightly browned. Roll cookies in additional powdered sugar while warm. Cool on wire racks and roll cookies again in powdered sugar.