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Class frequency
Class hierarchy
e20/
e20/
Intangible
http://dewey.info/class/305.42/e20/
10663603
1157391
11898113
19741288
20104514
20854201
21374381
21876738
221669802
221669858
22596878
22863057
235942463
24906434
25373007
25509783
25631791
260948
26910315
2722095
28296654
28392432
28586738
28929143
30547625
30818340
30917324
32114834
32463606
32969865
33146591
34356323
500069577
778982006
943295524
about
e20/
Intangible
http://dewey.info/class/305.42/e20/
type
Intangible