RM author of The Runaway is an Australian Children's writer, b.1926.
RM author of Street People Speak was Ruth Ritterhouse Morris, a Canadian Quaker legal reformer, 1933-12-12 to 2001-09-17. (see Wikipedia above).
RM author of Scottish Healing Wells was a Scots author publishing in the 1980s.
RM author of Dr Angelina Bean in Oz may possibly be the same as #1 but there is no evidence that this is so. The works were published some time after The Runaway and the style does not sound similar. Oz is where the wizard was rather than Australia! Wikipedia indicates that this may be the same as 2.