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Naturvitenskap
Geovitenskap
Geologi, hydrologi, meteorologi
Historisk geologi
Bestemte geologiske perioder
Kenozoikum
Oligocen
Preferred term
551.785
Oligocen
Broader concept
551.78
Kenozoikum
Entry terms
Oligocen--geologi
Identifier
ocd00147770
Notation
551.785
URI
http://dewey.info/class/551.785/e23/
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Created 2/4/10, last modified 8/5/14