"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."
"In making the following study of certain attacks upon fortified harbors it was my object to make an analysis of each campaign, and of them all collectively, in order to attempt to derive well grounded conclusions as to future wars."