E.D. Report, Issue 1; Issues 3-16

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Forest Service, U.S. Department of Agriculture., 1944 - Fire extinction
 

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Page 18 - Preventive Maintenance Service and Technical Inspection Work Sheet for Wheeled and Half-Track Vehicles.
Page 28 - ... a fixed position over a spot on the ground or water which compresses a cushion of high-density air between the main rotor and the ground or water surface and thus increases the lift produced by the main rotor. Normally the main rotor must be within one-half rotor diameter to the ground or water surface in order to produce an efficient ground effect. hovering out of ground...

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