High Speed Digital Design & Signal Propagation Howard Johnson Black Magic Signed. Includes both High-Speed Digital Design A Handbook of Black Magic and High-Speed Signal Propagation Advanced Black Magic by Howard Johnson and Martin Graham. Looks like the owner attended a convention on the subject hosted by Howard Johnson.
A 2 day workshop for serious digital designers called Sigcon. Also includes the flyer, and the book given out at the convention. Both textbooks are hardcover and are signed by Howard Johnson.The Signal one looks almost unused. The design one looks a little more used, but still quite good.