1 Phillips, Margaret E. O'Brien, Ekarestini. National Library of Australia. Australian Joint Copying Project handbook. Part 6, Public Record Office - Air Ministry, Board of Trade, Exchequer and Audit Department, Treasury and other Record groups / compiled by Margaret E. Phillips and Ekarestini O'Brien Canberra : 1995 National Library of Australia xix, 98 p. ; 2nd ed. 0642106347