Advanced Google searchUse the "site or domain" box to limit your search. You can enter .gov for U.S. government sites, or .int for international. You can also use a country code to limit to that country (example: .gr for Greece). To search within a specific site enter that site's URL (example: un.org)
You can do the same limit in a regular google search by using site: followed by the domain:
site:.gov