Fantasy Books:
Good Omens by Terry Pratchett & Neil Gaimen
Hogfather by Terry Pratchett (series)
The Deed of Paksennarion by Elizabeth Moon
Lord of the Rings by J. R. R. Tolkien
The Screwtape Letters by C. S. Lewis
The Narnia Series by C. S. Lewis
The Moon of Gomrath by Alan Garner
The Secret World of Og by Pierre Berton
Petty Pewter Gods by Glen Cook (series)
The Fafhrd & Grey Mouser Series by Fritz Leiber
The Conan Stories by Robert E. Howard (and only the ones by Howard, the others are trash)
Science Fiction:
The Science Fiction Hall of Fame (series, several editors)
Dangerous Visions edited by Harlan Ellison (series)
Remnant Population by Elizabeth Moon
Creatures of Light & Darkness by Roger Zelazney
Spinneret by Timothy Zahn
Space Viking by H. Beam Piper
Little Fuzzy by H. Beam Piper
Foundation by Isaac Asimov
WASP by Eric Frank Russell
The Witches of Karres by George Schmitz
Non-Fiction
Planet Quest by Ken Croswell
History of the Second World War by Sir Basil Liddel Hart
Lord High Executioner by Howard Engel