USCIS has an online Electronic Reading Room with access to Freedom of Information Act (FOIA) requested documents. The Reading Room is really a Web-based searchable database of public requested FOIA documents; mixed with USCIS documents that the government decided may have a larger public demand. You can use pull-downs to choose different listed subjects and include any month/year date from January 2011 to the present. You can also type in your own keywords to search.
For more detailed information about this subject and to use the Reading Room please review the USCIS Web Page, “Electronic Reading Room“ and try it for yourself.
Source of Information:
USCIS.gov, Web-Based Document Database: Electronic Reading Room