Polish Painting Masterpieces
Piotr Michalowski
"Gypsum Factory", c. 1832-33, oil on canvas, 59 x 71.5 cm, National Museum, Cracow

Source: Czapska-Michalik, Magdalena, „Piotr Michalowski [1800-1855]”, „LUDZIE CZASY DZIELA” series, Edipresse Polska S.A., Warszawa 2007, ISBN 978-83-7477-208-2