Book collections?

I have recently started collecting all the older tasmanian walking books, anyone else do this? They offer very interesting information and are nice to have around. So far I have gotten a couple of older tramps and the south west book. Does anyone know where the best place to get a copy of The World of Olegas Truchanas is? Where have others picked up these kind of books? Peaks and high places of cradle/ st. clair by Ian Boss walker sounds interesting but also very rare. Would those with a copy say its worth hunting one out? My next project is to find a copy of Above Me Only Sky, having heard ravings about how good it is.
What are others collections like? Do any of you make a goal of trying to establish some kind of 'full collection'?
What are others collections like? Do any of you make a goal of trying to establish some kind of 'full collection'?