This is neatly circumvented by The Internet Archive, on which the user "tpb" (The Pirate Bay?) copies Public Domain Google scans at a high rate without the geographic restrictions... Since those scans are PD, this is fully legal, as The Internet Archive has no contractual obligation not to distribute them...
My understanding is that Google does not fully admit that the photocopies of the illustrations in the books are PD. Also not clear to me that everything being scanned is being "publically" made available via Google Books -- some things seem to "come and go" on Google Books -- the scans Google makes available are becoming lower and lower in quality, and the restrictions on downloads that Google is imposing are becoming more difficult, etc. And pages are missing in ways that doesn't always seem like pure incompetence.