The service telephone number is divided into two parts: 8 1358 15: teaching materials, civil service examination, art, children's calligraphy, copybook, composition and word dictionary.

8 135822 Law, Social Science, Literature, Computer, Medicine, Architecture ...;

Books with titles, publishers or book numbers can be subscribed by phone: 8 13582 1.

This figure was learned three months ago, and now individual categories may be adjusted, but the figure must be accurate.