s57(80k)
hierarchical chain (BT): s s5 s57 s57( s57(8 s57(80 s57(80k
s
s5
s57
s57(
s57(8
s57(80
s57(80k
subclasses
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ILC 1 class details — ISKO Italia <http://www.iskoi.org/ilc/1/details.php> : 2011.07.15 - 2011.07.18 -