CRUST: 1 1/2 cups graham cracker crumbs 1/2 cup sugar 1/3 cup butter or margarine, melted APPLE TOPPING: 1/2 cup sugar 1/2 cup lemon juice 1 tablespoon all-purpose flour 1/2 teaspoon ground cinnamon | 1 dash ground nutmeg 6 Granny Smith or baking apples - peeled, cored and thinly sliced 1/2 cup chopped pecans FILLING: 3 (8 ounce) packages cream cheese, softened 3 eggs 3/4 cup sugar 1 1/2 teaspoons vanilla extract |