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e19/
e19/
Intangible
http://dewey.info/class/331.880924/e19/
10800330
11487253
11536104
11621854
11842163
12051412
12448459
12475576
12521081
12555599
13669043
14378528
15589791
16405215
16866578
17481066
18715207
18983544
20215594
5807026
7464092
7552804
7653205
8038827
8478996
8953384
9239443
9295839
9646065
9646068
about
e19/
Intangible
http://dewey.info/class/331.880924/e19/
type
Intangible