Committee 8 Officers Advanced Course, The Armored School; Himes, Cecil; Krampitz, Charles T.; Heffelfinger, Hugo W.; Falls, Carroll M., Jr.; Stout, Morris C.; Boehmer, William J.; Plume, Stephen K.; Styer, George D.; Huddleston, James M.
"This 1942 manual is published for the information and guidance of personnel using the 20mm aircraft gun materiel M1 and M2 and contains technical information requried in the identification, use, and care of the materiel."