Poet and musicologist John Streeter Manifold collected, researched and performed Australian bush ballads, published in The Penguin Australian Songbook (1964). He also advanced theories about the origins and transmission of Australian folksong, most notably in Who Wrote the Ballads? (1964). In the 1950s he collected a version of ‘Waltzing Matilda’, usually referred to as the Buderim variant of the Queensland version.
John Manifold’s papers are at the Fryer Library, University of Queensland
https://manuscripts.library.uq.edu.au/index.php/uqfl177
There are several recordings of him reading his poetry and being interviwed in NLA at
https://catalogue.nla.gov.au/Record/2984901
https://catalogue.nla.gov.au/Record/433798
His ADB entry is at
https://adb.anu.edu.au/biography/manifold-john-streeter-14797
and there is a Wikipedia entry