20-mm automatic gun M1 and 20-mm aircraft automatic gun AN-M2
By: prepared under the direction of the chief of ordnance.
Series: Technical manual / United States War Dept -- no. 9-227, Nov. 19, '42
Publisher: War Dept.
Published: 1942
Place of publication: Washington
Number of pages: 96
Subjects: United States. Ordnance Dept.; Automatic weapons.; Guns, Aircraft.; Guns, Automatic.