This item contains the following correspondence:

1. 7 July 1975. Typewritten letter to Johnson discussing the mineralogy of Pernatty Lagoon, South Australia. One page.
   
   
2. 17 March 1976. Typewritten letter to Johnson apologising for delays in processing data sent by Johnson and offering to bring results to Adelaide. One page.
   
   
3. 25 November 1980. Typewritten letter to Johnson discussing the identification of minerals from the Mount Gunson (SA) deposit. Two pages.
   
   
4. 5 November 1981. Typewritten letter to Johnson discussing the identification of native bismuth in the Mount Gunson (SA) deposit and the progress of Collins' study of the mineralogy of the Mount Gunson area.
   
   

Australian locations mentioned in this correspondence include Pernatty Lagoon (SA) and Mt Gunson (SA).

Individuals mentioned in this correspondence include Peter Curtis.