NRS 12825 Public Works: Competition drawings submitted by Jørn Utzon to the Opera House Committee, 1956 West elevation [SZ 112] http://investigator.records.nsw.gov.au/Entity.aspx?Path=\Series\12825 NRS 12707 Public Works: "Sydney National Opera House" ("Red Book"), March 1958 West elevation Sketch [SZ 107] http://investigator.records.nsw.gov.au/Entity.aspx?Path=\Series\12707