Excellent reference! Thanks, I'll be looking for that one. Now that we have virtual book options I only buy 'hardcopy' books that I like so well I want to read or reference them again. I love having paper books - virtual books just don't seem like very permanent - like I won't lose them somehow. I've had my computer storage go bad and lost a bunch of stuff that I really miss. Now I have double backups but still... In a pinch, a full bookshelf would make an excellent insulation - the excuse I use for buying books I want!