Question for the Tekumel scholars - What else should I Pick Up?

Ok. I've got a copy of EPT (a reproduction of the Gamescience reprint) and a set of maps (reprints of the 4 part world map, originally published in Swords & Glory, Vol 1) coming from Noble Knight. I found a copy of The Man of Gold at 2nd & Charles, the other day.

So, what else would you highly recommend I pick up or hunt ebay for? With an eye towards running the campaign, as opposed to just collecting.