Index of articles from over 10,000 journals in the sciences, social sciences, arts, and humanities. In addition to multidisciplinary searches, Web of Science provides tools to track citations to individual articles from their date of publication to the present. Now includes Book Citation Index and Conference Proceedings Citation Index. Coverage: 1984-present.
American Psychological Association’s index of scholarly journal articles, book chapters, books, and dissertations in behavioral science and mental health. Coverage: 1887-present (journals); 1987-present (books and book chapters).
The complete archive of National Geographic magazine — every page of every issue — along with a cross-searchable collection of National Geographic books, maps, images and videos. Coverage: 1888 to present.
Over 600 images can be downloaded for educational use.