This recipe was typed on a large index card, date unknown. Recipe is typed below (as-is) with a scanned copy.
Carmel Pop Corn
5 quarts popcorn (unsalted)
1/2 c. Karo syrup, white
2 sticks butter
2 c. brown sugar
pinch of cream of tartar
Bring to boil and boil 5 minutes. Add 1/2 teaspoon baking soda. Pour over and bake at 200° for 1 hour. Stir every 10 minutes.