National Geographic--Geography of the Air,by Adolphus Washington Greely 63122 [Full title: The National Geographic Magazine--Geography of the Air] [Subtitle: Vol. III., PP. 41-52, May 1, 1891] [Link: http://www.gutenberg.org/6/3/1/2/63122 ] [Files: 63122-8.txt; 63122-h.htm] Thanks to Ron Swanson Regards, Al