The books of the Superstar main station and the e-books at the entrance of colleges and universities will be revised by staff after a while, so it is normal that the books you were looking for can't be found.

Personally, I think there are fewer books on the superstar main station. Not as good as the mirror books in front of the university library.

There are other things to explain:

1. Superstar main station has books, but universities may not have them. On the contrary, the same is true.

2. The authority of each university is different, so the number of e-books in each university is different.

3. Some e-books in colleges and universities are not clear versions, but fast versions, so you should pay attention when downloading them yourself. The quick version is not clear, and the clear version is generally clear.