Quantum redactiones paginae "Stratigraphia (geologia)" differant
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* ''[http://www.stratigraphy.org/index.php/ics-links International Commission on Stratigraphy]''
** '"[http://www.stratigraphy.org/index.php/ics-chart-timescale International Chronostratigraphic Chart]" variis linguis edita
* ''[http://www.stratigraphy.net/ Stratigraphy.net]''
; Indices stratigraphici nationales
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