The United States Government Manual provides the following organizational chart of U.S. Government. It's a good starting point for where you can start your research: Legislative, Executivie, or the Judicial Branch.
Another good place to start your research may be the website of the specific department or agency in which you are interested. The A - Z index of U.S. Government Departments and Agencies is a directory of U.S. federal government agencies, departments, corporations, instrumentalities, and government-sponsored enterprises. This index provides websites, email, phone numbers, addresses, and.much more.
Most government websites are structured similarly and will feature the following sections:
About Us: A government website's "About Us" section will include information on the agency's mission statement, organizational structure, statutory authority, annual reports, and sometimes information on their budget.
Statutes and Regulations: A typical government website structure often includes a dedicated section for accessing "statutes" (laws passed by Congress) and "regulations" (detailed rules implemented by that specific agency or department based on those statutes),
Freedom of Information Act (FOIA): This section will describe how to submit a Freedom of Information Act (FOIA) request, the agency's FOIA process, contact information for the agency's FOIA officer, and a link to the agency's FOIA reading room where proactively released documents can be found.
All materials added to the documents collection are cataloged and inventoried on the online catalog which contains the holdings of the University Library, Law Library, and Special Collections. The public may search the online public access catalog from anywhere in the world. In addition to the online catalog, the Law Library provides access to other sources of information about government documents. These include access to the internet, where users can access all of the resources available through the FDLP, as well as other depository collections (e.g. the Regional Depository Library located elsewhere on campus).
Anyone may use the government documents collection. Print documents are located throughout the Law Library and may circulate to users with a library account. Microfiche documents are located in the Lower Basement. A reader-printer-scanner provides copies at no charge. Printing/Copying using the multifunction machines in the Law Library are available for a cost of .10/page, but most things are able to be scanned/emailed for no charge.
Use the Catalog of U.S. Government Publications (CGP) to identify publications from the legislative, executive, and judicial branches of the U.S. government. If you find a title of interest, click on the Locate in a Library link near the bottom of the record to identify a library that might have the publication in its U.S. depository collection. Make a note of the SuDoc number and Item number of the material.
The CGP is not comprehensive for pre-1976 government publications. These can be identified by using Worldcat and the earlier years of the CGP and related catalogs shelved in the Documents Assistant's office.