The Internet has become the ultimate research library, especially for older and rare volumes that one used to have to look at only in rare book collections or major university libraries. I noticed recently that several of the earliest journals devoted to the study of Islam now have their earliest versions available online. The extraordinary site, The Internet Archive, now has the first 11 volumes of Der Islam, the first 6 volumes of Die Welt des Islams, and the first 12 volumes of The Moslem World. This is a great resource for scholars, but also worth a browse, especially if you know some German. There is much of value, historical as well as continuing scientific, in these early volumes.