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× 9. Aircraft Balancing and Center of Gravity Control 9. Aircraft Balancing and Center of Gravity Control $20.00
$20.00
× 12. Weight Control - Aircraft Design Problem 12. Weight Control - Aircraft Design Problem $20.00
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× 33. Some Problems in the Selection of Optimum Airplane Configurations for Minimum Weight 33. Some Problems in the Selection of Optimum Airplane Configurations for Minimum Weight $20.00
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