We have recently added a large number of journal and book series backfiles from the following publishers:

Elsevier ScienceDirect: 70+ journal titles (list 1 / list 2) in Economics & Finance and 38 book series in the Life Sciences

Oxford Journals Online: 150+ journal titles across all disciplines

Sage Journals Online: 380+ journal titles across all disciplines

SpringerLink: 825+ journal titles across all disciplines and 14 book series in the sciences

Wiley-Blackwell (Wiley InterScience): 150+ journal titles mainly in Medicine and related disciplines