Since these guys were American, English law doesn't matter one wit. And NO, none of these guys' work is public domain. Heck, there isn't a single person posting on this website who could accurately tell you the date for which any of their works will become public domain.
The works ARE public domain in England. It is a matter for the ports to not permit import of such compilations as they would be in violation of US copyright law.
That is why there is a big stink over the works POST 1959 lapsing into the public domain.