Let's post in this thread instead of splitting the discussion.
Sol, send me a personal message with your e-mail address, and I can e-mail a scan to you. The version I have is copyright 1942 by G. Schirmer. Josef Marais says he introduced the song to American radio audiences in 1939, but that it comes from the Boer War of 1901. I'd say it's relatively clear that it's in the public domain - but not completely so. My Travelin' On With the Weavers songbook also gives the 1942 Schirmer copyright and attributes the song to Marais and Miranda.
-Joe-