We have a few online reference resources - click on the title link to access these dictionaries.
CQ Researcher is an online database that contains information similar to what you'd find in an encyclopedia - here are a few topics that it covers:
Reference resources can give you a brief overview of particular topics, and often will provide bibliographies at the end of articles that will give you more resources on the subject. Here is a list of some of the reference resources we have in our print collections: