Power series
U.S.G.P.O.
Robert F. Dorr
Motorbooks International c1991 Power series
Available at 1 libraries
[U.S. Govt. Print. Off.] 1936 Power series no. 6
U.S. Govt. Print. Off. 1936 Power series no. 4
U.S. Govt. Print. Off. 1936 Power series no. 2
U.S.G.P.O. 1936 Power series no. 3
Available at 3 libraries
U.S. Govt. Print. Off. 1935 Power series no. 1