Institute of Navigation,ION National Space Meeting on space navigation-theory and practice in the post apollo era.ION National Space Meeting on space navigation-theory and practice in the post apollo era (1970).[s. n.],1970.
NAFEC and FAA.Proceedings of the National Aerospace Symposium (1978 : Atlantic City):Theme : Air navigation-today and in the year 2000.Institute of Navigation,n.d..