What's the one Lincoln book you want but can't justify getting?

[Steve]

Probably the hardcover version of The Lincoln Assassination: The Evidence edited by William C. Edwards and Ed Steers.

It pays for itself in usefulness!

I can't think of one offhand, though I'm sure there's something long out of print that would be nice under the tree.

I paid $10 for the Google Books version of the The Evidence, but Google wouldn't let me download a copy to my computer.