What does USSR stand for?

The list of USSR abbreviation meanings.

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2
Uninterrupted Sustained Silent Reading(Education)
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APASmart Define. (2017). ussr. Retrieved September 28, 2026, from http://smartdefine.org/ussr/abbreviations/f/Education
ChicagoSmart Define. 2017. "ussr" http://smartdefine.org/ussr/abbreviations/f/Education (accessed September 28, 2026).
HarvardSmart Define 2017, ussr, Smart Define, viewed 28 September, 2026, <http://smartdefine.org/ussr/abbreviations/f/Education>.
MLASmart Define. "ussr" 17 November 2017. Web. 28 September 2026. <http://smartdefine.org/ussr/abbreviations/f/Education>