Unfortunately, architectural plans have not commonly been kept as archives. This is particularly the case for commercial and residential buildings. However, there are a number of resources which you can try.

Drawings, sketches, plans and photographs of Australian colonial architecture, ancient buildings from China and Greece, furnature designs and sketches for a proposed "ideal city" of Kurrajong.

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Wolfgang Georg Sievers, AO (1913–2007) was a well-known modernist photographer who documented Australian architecture and industry over a career spanning almost 60 years.