Use "and", "or" and "not" keywords to refine your search. Double quotes (e.g. "licence holders") define a phrase.
Historical Documents refers to those documents which have been archived or are outdated. Historical Categories refer to past Authority Assessments or Investigations. Selecting "No" will reload the search page to display only non-historical Assessments and Investigations to choose from and any searches will return only non-historical documents.
Select multiple categories by holding the "Ctrl" key ("Cmnd" key for the Mac) while you click.