I am having quite a bit of luck with my ancestors in Australia because Victoria is so small.  I have found a wonderful book. It is called People and Places, Western Victoria 1854-1865, from the diary of Augustus Bostock.

William Latta, c 1818, Donegal. (The man who suicided in 1876 at Grassmere near Warrnambool) was Augustus Bostock neighbour and had land next door. Augustus's diary has multiple references to our ancestor, William Latta and strangely enough the family that his son, John married into after his father died. John Latta married my Great Grandmother, Grace. Her family was Parker and her mother's family were Lindsays. They are all referred to quite frequently in the book.

The Diary eg
15/12/1854
Went to see Latta and Doy about building the bridge. (The bridge was required for them all to access parts of the road to Warrnambool)

17/3/1855
Thrashing machine came to Lattas. (It seems Latta grew wheat and raised beef etc and sent some of the food to the miners at the Goldfields. This was a very significant period of Goldmining in Australia.)