subject research guides available through the Library's website. Each guide provides a list of the relevant databases, a subject-specific search box, and the call number ranges for physical materials within the subject. If you're interested in contacting the librarian who specializes in that subject their information is also made available on each page.
Don't forget, you could always use the Discovery @ Tarleton search to aid you in your research endeavors. (Tell us what you think of it by filling out the short survey, too!) Best of luck on the final few weeks of Spring 2013!