Title: Air navigation
First published: 1931
Description: <a href="http://uf.catalog.fcla.edu/uf.jsp?st=UF025192859&ix=pm&I=0&V=D&pm=1" rel="nofollow">http://uf.catalog.fcla.edu/uf.jsp?st=UF025192859&ix=pm&I=0&V=D&pm=1</a>
Subjects: Navigation (Aeronautics), Navigation (Aeronautics.