Heavy books

These are my Japanese books (sorry about the huge picture, seems I have removed my image editing program, so I was unable to shrink it). We were talking at the Japanese class about how many books we had, and I just thought I'd find out. Each stack measures about 23 cm. Which means I have about half a meter with Japanese books. There are the ones I have bought on the left and the my notebooks, the box under the binder is full to the brim with cuecards. And of course I had to weigh them>.< The left ones weighed about 6,4 kilos, and the right ones weighed about 5,2 kilos.
That's a lot of paper that is>.<

Word of the day:
多大 - tadai - heavy, much