JSTOR is an online collection of hundreds scholarly journals that spans many disciplines. The journals included in the collection data back as far as the 1600s, and new titles are being added regularly. JSTOR is committed to providing access to the complete run of a journal and to providing high-resolution, scanned images of journal issues and pages as they were originally designed, printed, and illustrated. JSTOR typically does not include the most recent issues of a continuing journal. This is what is termed the "moving wall."
Your Gould Library reference librarians are happy to help you work with JSTOR.