In any major web search engine, you can search a specific website or type of website using site searching. Type site:[website] then your search words into the search engine..
Ex: To search the EPA's website for information on climate change, use "site:epa.gov climate change".
You could also search through all US government websites by using site:.gov and then your search. Ex. "site:.gov national security"
Beeghly Library collects a number of print government documents on the upper floor, as well as links to online documents, all of which can be identified using the catalog.
You can limit your search to only government information in the catalog:
Government documents use a different call number system than the rest of the library and are organized by the department that published them. University of Buffalo Libraries have a list all of the departments and their letter codes.