A file dating from 1949 in the Post and Telegraph series, held at the National Archives of Australia’s Queensland office, had been badly affected by water and mould. the file includes a hand coloured map and significant silver gelatin photographs of post office buildings, drill halls, townships and tlegraph offices. The file is considered a core record of local significance and was referred to the Archive’s Preservation section for advice. Conservators in the Sydney preservation laboratory assessed the file and undertook dry cleaning to reduce the mould and then sent it to the Melbourne preservation laboratory for further intensive treatment and digitisation. This project provided an opportunity for collaboration between cosnervation staff and highighted the importance of assessmetn throughout a treatment.