Start by going to the Classic Catalog Advanced search menu and go to the "LIMITS" options. Set your "Location" to (E.S. Bird Library - Govt Docs). Now select "Apply Limits." Now enter search terms, names, phrases, etc. into the search boxes to find documents from the Gov Docs collection
NOTE: These documents will have SuDoc call numbers
TIP: SuDoc call numbers like the example above have slashes "/" and colons ":" as part of the call number. This is how they differ from an LC call numbers.
ALSO NOTE: Some Gov Docs may be located in the general stacks and will have Library of Congress call numbers.
Here are various search engines for locating government information, both current and archived.