International Military and Defense Encyclopedia REF 355.003 I612 Jessup. Encyclopedia of the Korean War REF 951.904203 E56 Haythornthwaite. 940.27 N 216 h Higham. I REF 940.3 M367 Weigley. These journals can be found on the tall shelves behind the reference shelves.
Some journals also have their own consolidated indexes and can be a valuable source for information.
A few of the many on military history, these sites have both good content and links to other sites.