"... is operated by the National Film and Sound Archive (NFSA). The NFSA is the national audiovisual archive, collecting, preserving and sharing the nation’s moving image and recorded sound heritage. "The site provides access to various materials including news reels and historical footage.
Suggested terms to look for include - diary, diaries, letters, papers, documents, documentary or correspondence.
Combine these these terms with the event or person you are researching. (example: civil war diary)
Also search by subject for specific people and events, then scan the titles for those keywords or others such as memoirs, autobiography, report, or personal narratives.
Off campus access instructions (for e-books)
Australia and the War by 
Love letters of an Anzac by