Technically, the 'complete set' is 4 books which includes "the electromechanical era" edition.

True that   he was supposed to be doing a fifth book; "the solid state era" that never seemed to happen. He was going to do a story in it about my home brew 'Vortex' pin after i sent him photos of it and he liked what he saw. He asked me to do a full write up for the book about the game and how i got into the hobby etc (which i did).

I'm guessing the fifth book was never completed.. can anyone confirm this??