The Last Days of Harold Holt offering by Gaston Renard Fine and Rare Books, Melbourne .
In the Little Darwin file on Harold Holt is a letter showing that Dame Zara Holt was concerned about the impact of drilling for oil on the Great Barrier Reef.
In his university days, Harold Holt had an artist friend - John Horatio Busst, an environmentalist who went on to strongly campaign to prevent mining of the Great Barrier Reef .
In the Special Collections section of the Eddie Koiki Mabo Library , James Cook University, Townsville , are Busst's private papers, including three boxes of letters.
Busst wrote to US President Johnson seeking his support for a move to set up adjoining marine and wildlife parks in Australia in honour of Harold Holt .
Holt's love of spear fishing resulted in him ,third from the right , being met by a flip- flopping university student at James Cook University.