Search for: [Subject and Keywords = guide to interpersonal relations \(19 c.\)] OR [Subject and Keywords = Stosunki interpersonalne \-\- poradnik \-\- 19 w. \-\- \[JHPBN\]] OR [Title = O powinnościach człowieka] OR [Title = O powinnościach człowieka] OR [Creator = Pellico, Silvio \(1789–1854\)] OR [Creator = Pellico, Silvio \(1789–1854\)]