Cart Shopping Cart My Store Account Orders Downloads Shopping Cart Remove item Thumbnail image Product Price Quantity Subtotal × 1718. Weight Estimation of Unconventional Structures by Structural Optimization $20.00 1718. Weight Estimation of Unconventional Structures by Structural Optimization quantity $20.00 × 1161. V/STOL Presentation $20.00 1161. V/STOL Presentation quantity $20.00 × 1110. A Mass Properties Computer System for Integrating Multivehicle Space Programs $20.00 1110. A Mass Properties Computer System for Integrating Multivehicle Space Programs 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