TY  - BOOK
AU  - Lyon, Thoburn Cassady
TI  - PRACTICAL AIR NAVIGATION
U1  - 629.525 
PY  - 1963///
CY  - Annapolis, Md.
PB  - Weems System Of Navigation
KW  - Navigation (Aeronautics)
N1  - The First Edition Of Practical Air Navigation Was Issued In 1935 As A...Special Publication Of The Coast And Geodetic Survey...In 1940 It Was Issued As Civil Aeronautics Bulletin, No. 24
ER  -