From the Advanced Catalog Search, you can search by title, author, or subject.
To search just the government documents collection, you will want to use the options under "Add Limits" to limit your search by location. You can use the CTRL key to select more than one option or simply click on either "Government Documents" or "Colorado Documents."
To search by call number, select the "Number" search option from the Advanced Search page and the number type "Government Documents Number."