I got the whole set in hardcover in finnish (from the 70's) (Some of them are my dads originally, and the rest were hunted down from different antiquarian bookshops in a span of several years). I also got some from my now dead great-uncle, oldest of which are from the early 40's. I also got most of them in english (not all though.) Also got three books from the Venus series (two in finnish and 1 in english) and all the Pellucidar books translated to finnish (the first four books).