Wings of the Navy (Air Combat Stories for Boys, No. 6)

iii, 211 pp. Jacket art and endpapers by Joseph Clemens Gretter, who here and in other works (most notably Hardy Boys novels) used the name Gretta. "Irrepressible Jimmy and his pal Pooch Mallory are assigned duty as observers on blimps, and get into all the scrapes their fertile minds can invent until the climax when they capture a German spy."