[jrmg]

There’s a thorough explanation of the history of the poem and the research that went into rediscovering the author of the poem and [re?]producing the ‘final’ version presented in the article - scroll down to after the poem.

The conclusion is that “This version is essentially the author's own final text, as also published by New River Project in 1993” (so ‘1922’ in the page title and link text is arguably wrong, or at least misleading).