Cart Shopping Cart My Store Account Orders Downloads Shopping Cart “23. The Value of a Pound” has been added to your cart. Continue Shopping Remove item Thumbnail image Product Price Quantity Subtotal × 4. The Weight Engineer and the Flutter Problem $20.00 4. The Weight Engineer and the Flutter Problem quantity $20.00 × 23. The Value of a Pound $20.00 23. The Value of a Pound quantity $20.00 Coupon: Apply coupon Update cart Available coupons (Click to apply). Cart totals Subtotal $40.00 Tax $0.00 Total $40.00 Proceed to checkout