Militaria are artifacts or replicas of military, police, etc., collected for their historical significance. Such antiques include firearms, swords, knives, and other equipment such as uniforms, military orders and decorations and insignia. An alternate name, used by many dealers, for militaria is 'military antiquities' or 'military antiques'.
"Militaria literature"
The historian Henning Pieper coined the term to describe the "huge array of non-scholarly works which can be summarised as belonging to genre of 'militaria literature'" that in his opinion provide a highly-selective view of the German war effort during World War II. He includes books by Christopher Ailsby, Herbert Walther, and Tim Ripley in this group.
References
Militaria Wikipedia(Text) CC BY-SA