Look in the Library Catalog. Documents in our collections that were produced after 1976 are cataloged, right along with all of our other books, journals, CD-ROMs, DVDs, and other materials! The catalog will also list many (but not all) publications from before 1976.
You can also check a database called Catalog of U.S. Government Publications . Like our catalog, this database only lists publications after 1976. You can use it to find publications of interest that we may not have in our collections.
Documents are stored at the West Campus Library. They have produced this helpful Page as a locator tool for the government documents collections which have not been cataloged.
You can find a list of SuDocs numbers and the agencies they represent Here.
Two other favorite online sources for government information are ProQuest Congressional for a vast array of legislative information and ProQuest Statistical Abstract, a great locator for statistical information from the government as well as other sources.