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× 13. Will Accessories Impede Our Payload? $20.00
$20.00
× 7. Predetermination of Weight Efficiency $20.00
$20.00
× 23. The Value of a Pound $20.00
$20.00
× 12. Weight Control - Aircraft Design Problem $20.00
$20.00

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Subtotal $80.00
Tax $0.00
Total $80.00