LEFEVER, D. WELTY.
Principles and techniques of guidance, by D. Welty Lefever, Archie M. Turrell & Henry I. Weitzel.
LEFEVER, D. WELTY. Principles and techniques of guidance, by D. Welty Lefever, Archie M. Turrell & Henry I. Weitzel. © 3Jun41; A154162. D. Welty Lefever (A); 14May69; R461652.
D. Welty Lefever|A