Paper published in December 2022 by the World Bank Group on the educational and economic impacts of COVID-19 school closures in Poland.
Papur a gyhoeddwyd ym mis Rhagfyr 2022 gan Grŵp Banc y Byd ar effeithiau addysgol ac economaidd cau ysgolion yn sgil COVID-19 yng Ngwlad Pwyl.