This item consists of a one page handwritten letter to Johnson and a lecture transcript. The letter relates to the transcription of a lecture given by Johnson at a meeting of the Mineralogical Society of South Australia on 2 November 1982. Attached to the letter is a seven page typed transcript of Johnson's lecture. 15 November 1982. Eight pages.

Australian locations mentioned in this correspondence include Lake Gilles (SA), Mount Gunson (SA), Callington (SA), and Broken Hill (NSW).

Individuals mentioned in this item include Brian Richards, and Ron Galbreath.