Your best bet is to find out who the course photographers were at Gold Coast, Redcliffe, Moonee Valley, Kilmore and Albion Park back then and give them a quick call. I'm sure the trotting clubs could point you in the right direction. Judging by the amount of wins between them, it's likely there'll be a few photos around. You could also ask your local papers, as back then the trots got more newspaper coverage than it does today I'm sure.