The books in the library are arranged by the LC , Library of Congress System , system. Materials are arranged by disiplines - subjects basically. The reference collection is a great place to begin your research process.
Many student like to begin their research by consulting an encyclopedia.
There are many books in the Circulating Collection that will get you well on your way to producing an interesting project. Remember, if you find a really great source, check the sources they used. Many books will include include footnotes and a bibliography. The catalog record will list the subject descriptors used by the cataloger to describe this book. You can use them to find similar books - the descriptors are even hypertext so you can link directly to books under that heading.