Great stuff, Tania! Good find on Ryersons, death notices may lead to living descendants!
The only bit I think may be in dispute is the SA midwife - I am pretty sure nurses (and teachers) back in the day had to be single women - in any case, there was a Mary Hilda MARTIN born in 1924 in Clare district of SA who I think is most likely this woman; seems more the case that Archibald & Mary stayed in NSW ;)