All variations on the 20mm FLAK anti-aircraft gun, including towed versions, and self-propelled as used by all arms of Wehrmacht.[AuthorName]By (author) Werner Müller[/AuthorName][AuthorBio][/AuthorBio][NumIllustration]b/w photographs, line drawings[/NumIllustration][CoAuthor][/CoAuthor][SubTitle][/SubTitle][ColorPattern]b/w photographs, line drawings[/ColorPattern]