The most frequently-used databases
Full text comprehensive databases range from general reference collections to specially designed, subject-specific databases for public, academic, medical, corporate and school libraries.
Full text online backfiles of core scholarly journals on many subjects. JSTOR's full-text coverage begins at the first issue of each journal and usually ends within five years of the present.
ProQuest Central is the largest aggregated full-text database in the market today, with thousands of periodical titles and millions of full-text articles available.