M. Barnard Eldershaw was the pseudonym used by the twentieth century Australian literary collaborators Marjorie Barnard (1897-1987) and Flora Eldershaw (1897-1956).
Their final collaborative novel, Tomorrow and Tomorrow and Tomorrow, published in 1947 as Tomorrow and Tomorrow, is considered to be one of Australia's major early science fiction novels and was highly regarded by Australia's only Nobel Prize winner for literature, Patrick White. It is set in the 24th century and features Knarf (a novelist and historian whose name is an inversion of Frank Dalby Davison's first name). The book is essentially a story-within-a-story, with much of it comprising an historical novel, written by the character Knarf, about "old" Australia from 1924-1946.
It was not published in its entirety until Virago Press reissued it in 1983.