@n8
But the original copyright is listed as 1961, so the term would not have run out before 1978, when the law changed to conform to the Berne Convention.
As far as I knew, anything under copyright in 1978 was automatically extended at that point.
There WAS another way you could fall out of copyright in the 1960s -- which was to publish w/o notice. That's what happened to "Night of the Living Dead".
Or it could've been explicitly disclaimed.