These (4) Adelphi Papers Booklets were published in the 1980’s by the International Institute for Strategic Studies. The focus of the papers is to disseminate research about military policy and defense strategies. These copies were owned by military author Norman Polmar and 1 of the booklets is signed with his name on the cover. Overall condition is good. #223 has some staining on the cover, but the inside contents are unaffected. Let me know if you have any further questions. Thanks!