Correspondence: From Utzon re Stage III and Secretary of the Department of Public Works re professional fees, August 1963 to May 1964 Date: August 1963 to May 1964
Correspondence, including arbitration dispute with Civil and Civic,, June 1959 to January 1962 Date: June 1959 to January 1962
Correspondence, June 1957 - October 1958, mainly between Ashworth, the Opera House Committee and Ove Arup. These include draft agreements dated January and June 1958, a hand written biographical note about Arup, c. 1958 and a memorandum of arrangement between Ove Arup and McDonald Wagner and Priddle dated February 1959
Correspondence (June - July 1966) relating to design of commemorative medal, the car park from the Secretary, Dept. of Public Works and the ABC's requirements for concerts from the ABC Chairman
Correspondence mainly between Jørn Utzon and Ashworth or the Opera House Committee, February 1957 to June 1960. Subjects include: aerial view of the Opera House (with sketch), model and general plans, Utzon's C.V. and conditions of appointment, viewing platform and site noticeboard, tenders; orchestra pit, with sketches; organ; stage machinery (the latter includes a paper by Stefan Haag); quarterly report, April 1960, drawings (these are located among the Map Folios)
Correspondence mainly between Jørn Utzon and Ashworth or the Opera House Committee, July 1960 - May 1964 Date: July 1960 - May 1964
Correspondence, October 1955 - October 1960, of Ashworth, the Sydney Opera House Committee and the Opera House Executive Committee [n.b.]. the Sydney Opera House Committee and Trust were incorporated circa June, 1957].