At the risk of triggering spam filters on a global scale, here’s a resource that may have mileage the world over.
I am still a big believer in tangible reading material rather than ebooks simply because there’s something nice about being able to leaf through paper pages. Why would you want to replace your book shelves or library with a Kindle? That said there are occasions when being to scour a single paragraph or chapter of a technical manual for that golden nugget pays dividends.
I stumbled across this site the other day and it’s a huge repository of scanned and digitised technical books on which the copyright has lapsed.
Admittedly some of these are very old, but like any library of reference material there’ll be something in there for someone somewhere.