The most common 3rd-grade Russian language workbooks available on platforms like GDZ.ru include:
Русский язык 3 класс рабочая тетрадь Канакина часть 1 и 2 gdz po russkomu iazyku 3 klass tpo
These resources are widely used by students and parents in Russia to check homework accuracy and understand complex grammar rules. Popular Authors and Workbooks gdz po russkomu iazyku 3 klass tpo