Preheat oven to 350 degrees F. For New York Style Cheesecake omit lemon juice and sour cream.

Mix graham cracker crumbs with melted butter and press into the bottom of a 12" springform pan. Beat the 4 packages of cream cheese until fluffy. Gradually add the condensed milk and beat until smooth. Add the 1/3 cup of flour, the eggs and vanilla and mix well.

Pour into the pan and bake 1 hour until lightly browned. The center may not seem completely set. Remove from oven and cool on a wire rack until completely cool. Run a knife around the edge of the cake but do not remove the rim. Chill for several hours or over night. Remove the rim and slice into small pieces.This cake will provide 12 to 16 pieces. Top with your favorite fruit if desired.

For a lighter, lemony cheesecake - preheat oven to 300 degrees. Make the crust as instructed above. Beat 2 - 8 oz. packages of cream cheese. Add 14 oz. of sweetened condensed milk, 3 eggs, the lemon juice and sourcream. Pour into pan and bake for 50 to 55 minutes unti the cake springs back when lightly touched. Follow the same directions above for cooling, chilling, and serving.