Sky Radiation -- See Atmospheric radiation Here are entered works on the infrared radiation emitted by or propagated through the atmosphere. Works on the total infrared radiation emitted from the earth's surface are entered under Terrestrial radiation.
--subdivision Airborne troops under armies, e.g. United States. Army--Airborne troops; and subdivision Armed Forces--Airborne troops under names of countries, e.g. United States--Armed Forces--Airborne troops; also names of individual airborne units, e.g. United States. Army. 550th Infantry Airborne Battalion