Phenomenology study DDC numbers 13
1. 100-199, 150, 152.4, 153, 155, 158, 570.1
2. 006.3, 303.4833
3. 300-399, 200-299, 306
4. 400-499, 800-899, 700-799
5. 500-599, 570-579
6. 610-619, 640, 613, 615.8, 616-618
7. 500-599, 510-519, 520-529
8. 600-699, 620-629, 004, 005
9. 500-599, 550-559, 577, 628
10. 300-399
11. 700-799, 800-899
12. 370-379
13. 100-199, 200-299, 150, 152.4, 153, 155, 158