In the library, you usually buy several books of each kind, and these books have different uses. The concept you are talking about is the state of the book. Some books are only allowed to be read in the reading room-internal reading, some can be checked out-checked out, and some are used as preservation books (generally only a few people such as teachers and graduate students are allowed to read), so as to realize the functions of library preservation-stacks and basic collections. Never heard of "Tibet". Maybe this book has just entered the library and is being processed.