Correction. The website in question indicated that books can be printed.
But my computer a Macintosh Intel and my older computer indicated that the books could not be printed especially the DJVU books. One of the well known websites which most of use for research wanted to place every book in print on the website. ( I wrote a blog about it several years ago in Chessville). But I believe they ran into copyright infringements and ceased the project.
There are online library sites where books including chess books can be read.
If any of the books in the website can be printed I will let you know without indicating the name of the site.
For a good collection without copyright violations go to
Free Chess e-Books
Note that chessville offers many of the same books.