2Roland Wilson,ed.Official Year Book of The Commonwealth OfAustralia[M].NO.38-1951 chapter 12-trade,Commonwealth BureauOf Census And Statistics,pp482-485.
3Report by Department of Commerce&Agriculture,Canberra,May 1950.
4Roland Wilson. Official Year Book of The Commonwealth OfAustralia[NO.38-1951][R].Commonwealth BureauOf Census And Statistics,.