Class 22. According to the information of official website, Yunnan Communications Vocational College, there are 22 kinds of paper books in its library. They are A (Marxism-Leninism), B (Philosophy), C (Introduction to Social Sciences), D (Political Law), E (Military), F (Economy), G (Liberal Arts), H (Chinese), I (Literature), J (Art), K (Historical Geography) and N (Introduction to Nature).