Hey, I am looking for some help looking for a trilogy from sometime in the 70's or 80's that my dad mentioned was one of the best series he has ever read. He cannot remember the titles or the author. He just remembers that it was about a guy that gets dropped on some strange planet with all kinds of creative creatures and the planet itself is hostile. He said the writing was very creative. He believes the author wrote other books, but never gained huge fame and the books may be out of print. Anyone have a clue what these books could be or a hint to the author? I've searched like crazy with no luck and his birthday is coming up and I thought this would be an awesome gift. Thanks!!