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Class hierarchy
261.83/
261.83/
Intangible
http://dewey.info/class/261.83/
1004224
1029345
1231577
12677579
14780532
15801
1718522
1912326
2111417
2125391
224152489
3445266
3965210
4042457
44944104
5221322
553148
5828100
7539698
7578696
792410
826690
8716442
918828
9874967
about
261.83/
Intangible
http://dewey.info/class/261.83/
type
Intangible