Non-US readers of Google Books aren’t allowed to see most of the content. This is because of threats by European publishers afraid that somehow they might suffer some financial loss if their captive market could see books before 1923. Google responded by simply barring access to people outside the US. After all, if people outside the US want to be uneducated, how is that Google’s problem, they doubtless reasoned. But it has always been possible for the techno-literate to get around this, albeit with some effort.
But it looks as if Google books might be raising the drawbridge even further. Today I tried to get access to volume 13 of Texte und Untersuchungen, published in 1895. Of course as one of the humiliores of the internet, I knew that I would not be allowed to see it. But I tried my usual methods.
Unfortunately the download link still did not appear. With some wrestling, I was able to get a page with a link on, albeit not on the usual page, but for a while I feared the worst.
Never presume that Google books will always be available. It may not.