The following are good places to begin your research in theology and religious studies. There are examples of each type of resource given, but try doing some searching on your own - you'll be surprised how much you can find!
Atlases
Atlases are collections of maps, usually themed, like an atlas of the biblical world. You can find one by searching the catalog using the search terms ATLAS and terms like BIBLE, RELIGION, CATHOLIC, etc.
Atlas of the World's Religions CL Reference Stacks BL80.2 .A84 1999
Tubingen Bible Atlas CL Oversize Books G2230 .T943 2001
Almanacs
Almanacs are collections of important dates, facts, and statistics. They can be general, or specific to a topic. You can find one by searching the catalog using the search terms ALMANAC and terms like BIBLE, RELIGION, CATHOLIC, etc.
Almanac of the Bible CL Book Stacks BS417 .W48 1991
Concordances
A concordance is an index of words or phrases from a text or set of texts, which indicates each occurrence of those words or phrases in the text. They are particularly useful in biblical research, where phrases are re-used over time or are borrowed from current language for thematic emphasis. You can find a concordance by searching the catalog using the search terms CONCORDANCE and either the term BIBLE, or try using the specific version of the bible that you are reading, and put it in quotes: "New Revised Standard Version"
Eerdmans Analytical Concordance to the Revised Standard Version of the Bible CL Reference Stacks BS425 .W48 1988
Lexica
A lexicon is what you might think of when you think of a dictionary. They usually refer to a specialized dictionary or glossary used in a specific subject or field, and often in a language other than English. You can find a lexicon by searching the catalog with the search terms LEXICON and BIBLE.
A new reader's lexicon of the Greek New Testament CL Book Stacks PA881 .B87 2008
Dictionaries
A dictionary is what you might think of when you think of an encyclopedia. Dictionaries are single or multiple volume works that contain brief explanatory entries on terms and concepts, usually within a specific subject or field of study. You can find a dictionary by searching the catalog with the search terms DICTIONARY and more specific terms like BIBLE, WOMEN, JESUS, CATHOLIC, etc.
The New Interpreter's Dictionary of the Bible CL Reference Stacks BS440 .N443 2006
Women in Scripture: a dictionary of named and unnamed women in the Hebrew Bible, the Apocryphal/Deuterocanoncial books, and the New Testament CL Reference Stacks CL Reference Stacks
Encyclopedias
Encyclopedias are similar to dictionaries, but contain longer entries about specific topics, often written by authorities in the field. Encyclopedias can be general or can cover more specific topics. You can find an encyclopedia by searching the catalog with the search terms ENCYCLOPEDIA adn more speicific terms like BIBLE, JUDAISM, CATHOLIC, etc.
The Lion Encyclopedia of the Bible CL Book Stacks BS510.2 .L56 1986
Encyclopedia of the Historical Jesus [electronic resource]