I spent a couple years in the birdcage...I can assure you your friend is very happy to have someone sending books.....I sure was
Jean M. Aurel? I think is the authors name...wrote "clan of the cave bear"...good series...LOOOONG books...good reading when you have NOTHING else to do...
Michael Talbot is good....
How about "the end of time" by julian barbour? very good read
whiskeytango

I could go on for ever man...read over 600 books in those 4 years...lol