This collection comprises the work of Terence Sydney Holden's as part of the CSIRO (Commonwealth Scientific and Industrial Research Organisation) (1949-1989) and Patti G. Holden's work as laboratory technician at the Australian National University Botany Department. The bulk of the papers relate to Terence Holden's involvement with one of the first Australian large scale online, multi-user systems named DAD (Drums and Displays). There are several co-authored scientific articles and reprints showing formulas, methods and processes in the development of DAD later known as CSIRONET and notes on the history of the program and obituaries of some contributors. Copies of press releases, presentations, seminars, lecture papers, photographs and transparencies, highlight the program developments from the 1960's to the 1970's. Papers include invitations to speak at meeting and public events, meeting minutes, laboratory notebooks and several other research project articles dating back to 1949. Patti Holden's papers comprise diagrams and more than 20 local plant specimens for scientific botanical publications produced by Professor Pryor. A co-authored scientific journal is accompanied by a few laboratory photographs, design illustrations and mock ups for other departmental projects.