These are very interesting vintage gasoline coupons. It appears that you bought these books and then used the coupons to purchase your gas. The coupons come in sheets of 1c, 5c, 25c and 50c denominations. You will receive 2 random sheets for a total of 10 coupons.
For more vintage ephemera go to http://etsy.com/shop/CaityAshBadashery