Occurrence and temporal changes of pharmaceuticals in the Warta River in Poland during and after the COVID-19 pandemic https://www.byteseu.com/1278904/ #COVID19Reopenings #COVID19Waves #EnvironmentalSciences #HumanitiesAndSocialSciences #hydrology #multidisciplinary #Pharmaceuticals #Poland #RiverWaterContaminants #Science #SewageTreatmentPlants