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Naturvitenskap
Geovitenskap
Geologi, hydrologi, meteorologi
Historisk geologi
Bestemte geologiske perioder
Ordovicium og silur
Preferred term
551.73
Ordovicium og silur
Broader concept
551.71-551.79
Bestemte geologiske perioder
Narrower concepts
551.731
Ordovicium
551.732
Silur
Identifier
ocd00147753
Notation
551.73
URI
http://dewey.info/class/551.73/e23/
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Created 2/4/10, last modified 10/15/12