How to abbreviate Not Observed?

The ways to abbreviate Not Observed.

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Not Observed
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APASmart Define. (2017). not observed. Retrieved September 21, 2026, from http://smartdefine.org/not_observed/abbreviations/a
ChicagoSmart Define. 2017. "not observed" http://smartdefine.org/not_observed/abbreviations/a (accessed September 21, 2026).
HarvardSmart Define 2017, not observed, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/not_observed/abbreviations/a>.
MLASmart Define. "not observed" 28 September 2017. Web. 21 September 2026. <http://smartdefine.org/not_observed/abbreviations/a>