Story books should be listed in the cultural category. And the K category you mentioned is historical geography books.
I hope it helps you!
A Marxism–Leninism and Mao Zedong Thought B Philosophy C Introduction to Social Sciences D Politics, Law E Military F Economy G Culture, Science, Education and Sports G0 Comprehensive Cultural Publications G 1 Cultural Undertakings G2 Various Cultural Undertakings G3 Science, Research G4 Education G8 Sports H Language, Text I Literature J Art K History, Geography n Introduction to Natural Sciences O Mathematical Chemistry O 1 Mathematics O3 Mechanics O4 Physics O6 Chemistry P Astronomy, Earth Science Q Biological Science R Medicine, Health S Agriculture, Forestry T Industrial Technology TB General Industrial Technology TD Mining Engineering Te Petroleum, Natural Gas Industry TF Metallurgical Industry TG Metallography, Metal Technology th Machinery, Instrument Industry TJ Weapon Industry TK Power Engineering TL Atomic Energy Technology TM Electrical Technology TN Radio Electronics, Telecommunication Technology TP Automation Technology, Computing Technology TQ Chemical Industry TS Light Industry, Handicraft TU Construction Science TV Water Conservancy Engineering U Transportation V Aviation, Aerospace X Environmental Science Z.