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× 30. The Effect of Center of Gravity on Performance 30. The Effect of Center of Gravity on Performance $20.00
$20.00
× 12. Weight Control - Aircraft Design Problem 12. Weight Control - Aircraft Design Problem $20.00
$20.00
× 7. Predetermination of Weight Efficiency 7. Predetermination of Weight Efficiency $20.00
$20.00

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Subtotal $60.00
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Total $60.00