how hot-air balloons work (America's Library)
balloon height limitations (Argonne National Laboratory)
LTA Practical Test -- PDF format (FAA)
Balloons (Florida International University)
balloons and Archimedes Principle (NASA)
balloon calculation exercise (NASA)
balloons on Mars and Earth (NASA)
physics of balloon travel (NASA)
Upper Air Observations (NOAA)
Weather Balloons (ORNL)
Barrage Balloons (U.S. Air Force)
"Lighter-than-air Force" (U.S. Air Force)
LTA bibliography (U.S. Air Force)
LTA Craft in World War II (U.S. Navy)
Baron von Gablenz and superblimps (Wired Magazine)
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