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e19/
e19/
Intangible
http://dewey.info/class/909.82/e19/
10145447
10516741
10932568
11160174
11531872
12485689
12919428
14132920
14355784
15132680
15294773
16082556
19268387
463244061
5914254
8114595
838998
8475217
9284885
9828678
9833979
9969496
998576
about
e19/
Intangible
http://dewey.info/class/909.82/e19/
type
Intangible