Or be old fashioned like me. I have every Australian Trotting Year Book from the mid-70's up to the last in 2000 when HRA, in its infinite wisdom, decided it was easier (for it, not us) to attach "chronicles" to the HRA website. I'll give you the tip, of I wanted to look up a horse's performances in any particular year or feature race I can do it within a minute from where I am sitting now.
Try looking up the Mildura Cup winner for 1977 on the HRA website. Make sure you make a fresh pot of tea to drink while you scour through the pages.