This looks like a great project. There is a container at the School of Oriental and African Studies in London waiting to be filled with academic books for Juba University. Get down there if you have any and you are based in London; the deadline is the end of March.
More generally – many forms of aid seem to run into bottlenecks – for instance millennium villages might be wonderful but the well trained and motivated implementers can’t easily be scaled up to a national level.
Giving books to university libraries seems pretty scalable to me.