1847. Letter from Wojciech Jastrzębowski to Hippolit Skimborowicz, editor of the magazine: "Przegląd Naukowy, Literaturze, Wiedzy i Umnictwu Poświęcony" regarding the publication of a fragment of the publishing house The System of the world applied to universal needs.
October 17, 1856. Letter from Jastrzębowski to Stanisław Przyłęcki regarding the publication of "Ten Reminders for the Farmer".
"Ten Reminders for the Farmer"