Hello Ted12

Gregorys is part of Australian history.
They made street directories, maps, manuals and more.

https://en.wikipedia.org/wiki/Universal_Publishers_(Australia)

A trusted AUS company that clearly relied on OEMS
and expert advice. Australian as meat pies, kangaroos,
and an AUS historical car manufacturer ...

Is it worth buying? Can a lot be learnt from it?
Seems to be geared towards Australian mowers and not yank stuff

YES!

Hope this helps
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Jack