These sources cover a wide range of geographic areas and timelines. NOTE: what we call something now is not what it might have been called at the time, for example World War I won't work as a search term at the time of the war, so search for people, or specific battles instead. (Databases are accessible to UH students & faculty only.)
The Libraries maintain many periodicals and government documents on microfilm and microfiche that are not accessible in print or electronically. Just check the online catalog to find out their classification. At the M.D. Anderson Library, most of them are located on the first floor in Access Services. The readers have printers attached.