This Karl Langer collection contains architectural drawings, financial records, correspondence, biographical and personal notes, articles, speeches, job photos, subject files, diaries, journal and newspaper cuttings relating to the works, life and interests of Karl Langer. Buildings where Karl Langer was the architect are represented in this collection. Drawings and files include those realting to: St. Peters Lutheran College, Brisbane; Ipswich Girls Grammar School; Ipswich Boys Grammar School; Lennons Hotel, Brisbane and Lennons Hotel, Broadbeach. Karl Langer taught at the University of Queensland and Queensland University of Technology and there are related documents to this time. Plans and photographs of the Langer House, designed by Karl Langer are included in the collection. The Langer House was added to the Queensland Heritage Register on 21 October 1992.

Lecture given by Josephine Small (nee Delpratt) to the Queensland Women's Historical Association, 10 November 1966, on the history of the Delpratt family.
Also notes on the history of the family, and photocopied newspaper clippings on the history and sale of Tambourine House, home of the Delpratts. Includes one clipping on Normanby, home of the Macarthurs.