Jędrysiak, J. 2020. Benefits for the Prussian army by the inhabitants of the Grand Duchy of Poznań between 1815–1844. State of research and research perspectives. Roczniki Dziejów Społecznych i Gospodarczych. 81, (grudz. 2020), 225–261. DOI:https://doi.org/10.12775/RDSG.2020.08.