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.
Please visit this page for more information: Electronic Reading Room