How to abbreviate Ordovician?

The ways to abbreviate Ordovician.

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O:
Ordovician
For more, try ORDOVICIAN on ALL ACRONYMS DICTIONARY
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APASmart Define. (2018). ordovician. Retrieved September 28, 2026, from http://smartdefine.org/ordovician/abbreviations/a
ChicagoSmart Define. 2018. "ordovician" http://smartdefine.org/ordovician/abbreviations/a (accessed September 28, 2026).
HarvardSmart Define 2018, ordovician, Smart Define, viewed 28 September, 2026, <http://smartdefine.org/ordovician/abbreviations/a>.
MLASmart Define. "ordovician" 14 February 2018. Web. 28 September 2026. <http://smartdefine.org/ordovician/abbreviations/a>