Go to the <A target="_blank" HREF=http://classifieds.tractorbynet.com/default.asp?action=advsearch>search page</A>, enter the letter abbreviation for the state you want to search in, and select "State" in the "search field" drop-down box (3rd data entry field)...
For example, enter CT and select State from the drop-down, then click search... all ads in CT will be returned.