HathiTrust scans are often only available in the US. In this case, because it's apparently a reprint from the 40s, it's presumably been assumed to be still in copyright outside the US. This is probably incorrect: it's highly likely there was no additional copyright generated by the facsimile process.
That's disappointing. I didn't know that HathiTrust had geolocation-based visibility controls. The main reason I started using HathiTrust is because it had much better visibility than Google Books, which is terribly restrictive about allowing full book view for more recent out-of-copyright items.
