This series consists of reneoed copies of chemical defence (Australia)  reports prepared by Research and Experimental Sections of the Chemical Defence Board at various locations including Maribyrnong, Innisfail and Proserpine.The reports describe chemical defence experiments and their  findings, analysing the latter. The reports may contain plans e.g. elevation, affected area, apparatus, shelters; graphs depicting analysis and dosages; or photographs of the area from the air, experimental sites, explosions, bombs, protective equipment and photographs of volunteers, showing the exposed bodyparts. All reports were classified as secret.
Most of the reports seem to have been initially registered in an  annual single number system with an alphabetical infix Z according to a purple stamp in the top right corner, giving the file number and the registering agency, i.e. "Munitions Supply Research Labs.", "Munitions Supply Labs." or "Chemical Defence Board". Each report is numbered and the archivalarrangement is by report number.
The reports are attached to a dark red sheet by stapling and show  "Secret" and declassification stamp in the appropriate cases on the frontpage.
The notes were prepared at different locations including Maribyrnong  (Chemical Defence Section of the Munitions Supply Laboratories), Innisfail, and Proserpine (experimental stations of the Chemical Defence Board). The inter-relationship of personnel makes it difficult to determine when the records were kept by the laboratories, and when by the Board, or whether theyserved both. The latter is the most likely.