Web of Science Science Citation Index Expanded covers more than 8,500 notable journals encompassing 150 disciplines from the year 1900 to the present day.
Social Sciences Citation Index covers more than 3,000 journals in social science disciplines from the year 1900 to the present day.
Arts & Humanities Citation Index covers more than 1,700 arts and humanities journals starting from 1975 and 250 major scientific and social sciences journals.
Emerging Sources Citation Index covers over 5,000 journals in the sciences, social science, and humanities. Book Citation Index covers more than 60,000 editorially selected books starting from 2005. Conference Proceedings Citation Index covers more than 160,000 conference titles in the Sciences starting from 1990 to the present day.