Vincent E. Lally's copy of a weekly flight log from Aubrey Schumann to Akira Kasahara tracking GHOST (Global Horizontal Sounding Technique) balloons flying in the southern hemisphere for the period from December 15, 1973 to January 1, 1974. The log indicates each balloon's altitude, its identific... Show moreVincent E. Lally's copy of a weekly flight log from Aubrey Schumann to Akira Kasahara tracking GHOST (Global Horizontal Sounding Technique) balloons flying in the southern hemisphere for the period from December 15, 1973 to January 1, 1974. The log indicates each balloon's altitude, its identification number, the number of days in flight, where it was last heard, and the position of its latest transmission. Balloon 260163VV, noted in this log as "presumed down," still holds the world record for longest balloon flight at over 744 days. Show less