Just a few more good Time Travel books to add to the list. I have read others but these are the highlights of the ones I own.

Thrice upon a time - James Hogan
The Cross-Time Engineer (+ sequels) - Leo Frankowski
The Great Time Machine Hoax - Keith Laumer
Time on My Hands - Peter Delacorte
Island in the Sea of time (+ sequels) - S.M.Stirling
The Men Who Mastered Time - David Butler