This question is difficult to answer. Because different libraries divide stacks differently. From the library bar code, you can't see it at all. I don't know which stack is located from the classification number and call number, because the library adjusts the stacks according to the actual situation. The category on the spine label is the number of China Library Book Classification, which is mainly used for library shelving. According to that number, shelving will be very orderly. For readers, this number only makes sense if they know that classification very well. If you really want to know which books are still in which stacks, you should consult the staff of the specific library. In a better library now, books are returned centrally, and then the staff are assigned to the stacks. Look for stacks (lending service points) without reading.