Cart Shopping Cart My Store Account Orders Downloads Shopping Cart Remove item Thumbnail image Product Price Quantity Subtotal × 234. Problems Associated With Weight Estimation and Optimization of Supersonic Aircraft $20.00 234. Problems Associated With Weight Estimation and Optimization of Supersonic Aircraft quantity $20.00 × 236. Lightweight Foam Packaging of Electronic Equipment $20.00 236. Lightweight Foam Packaging of Electronic Equipment 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