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× 7. Predetermination of Weight Efficiency 7. Predetermination of Weight Efficiency $20.00
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× 9. Aircraft Balancing and Center of Gravity Control 9. Aircraft Balancing and Center of Gravity Control $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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