The largest bookstore in Yinchuan is in Jiefang West Street, and there is a Xinhua Bookstore opposite Park Street.
There seems to be a book fair in the lobby of Guangming Square these two days, and books are being sold. You can look it up in the latest news newspaper.
Then the Ningxia Library. East of People's Square. There are also book fairs to sell books from time to time. Please pay attention.
There are many books, magazines and reference books in the west of Shangdu. You can also go and have a look.
That's all I know.