Cart Shopping Cart My Store Account Orders Downloads Shopping Cart “23. The Value of a Pound” has been added to your cart. Continue Shopping “19. The Elements of Field Weight and Balance Control” has been added to your cart. Continue Shopping Remove item Thumbnail image Product Price Quantity Subtotal × 33. Some Problems in the Selection of Optimum Airplane Configurations for Minimum Weight $20.00 33. Some Problems in the Selection of Optimum Airplane Configurations for Minimum Weight quantity $20.00 × 23. The Value of a Pound $20.00 23. The Value of a Pound quantity $20.00 × 19. The Elements of Field Weight and Balance Control $20.00 19. The Elements of Field Weight and Balance Control quantity $20.00 Coupon: Apply coupon Update cart Available coupons (Click to apply). Cart totals Subtotal $60.00 Tax $0.00 Total $60.00 Proceed to checkout