Mom's Peanut Butter Cookies

1 cup brown sugar

1 cup sugar

1 cup peanut butter

3/4 cup margarine

2 eggs

2 cups flour

1 teaspoon baking soda

1/2 teaspoon salt

Preheat oven to 350 degrees.  Mix in order given.  Form into balls and press down with a fork like a criss-cross on each cookie.  Dip the fork into flour to prevent it from sticking to the cookie. Bake for 10 to 12 minutes.