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Aerodynamics
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-- See Also the narrower term Blades Here are entered general works on blades, paddles or vanes which are parts of hydraulic and pneumatic mechanisms such as propellers, water-wheels, turbines, fans or compressorsWorks on cutting blades are entered under the type of apparatus or the specific tool or weapon, e.g. Cutting machines; Knives; Swords
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-- See Also the narrower term Gas flow Here are entered works on the movement of a gas through closed or open channels or conduits. Works on the movement of underground gases from a natural source or engineered storage and barrier system upward toward the surface of the Earth are entered under Gases--Migration
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This heading may be subdivided geographically only by names of celestial bodies
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