Locating Previous Work
Bibliographies
See what work has already been done on your topic. Bibliographies are listings of citations of previous work on a topic.
Disseration Abstracts
Browse the listing of dissertations to see what kind of work is being done at the doctoral level.
Books
Books are often a great source of inspiration or data for your research topic.
Book Reviews
Book Reviews give you a detailed look at someone's personal, professional opinion on a book. These are helpful in many ways, including: showing common objections to methodologies, understanding what makes a strong case, and identifying flaws in argumentation. Often the reviewer will refer to other published works or provide a bibliography of his own, which can be yet another source of information.
MultiTree
The LINGUIST List's own project, MultiTree, graphically displays language relationship hypotheses and allows you to visually compare them.
LL-MAP
Another project by The LINGUIST List, LL-MAP, allows users to search digitized maps by region, country, subject language, author, or publisher. Users can also upload their own maps from data they have collected.