 The collection included medieval manuscripts, incunabula, old music prints, collections of the 18th-century maps, rare scholarly and scientific works, academic and school manuals from Jesuit colleges (the oldest from the Jesuit College in Polotsk), from missions (e.g.Minsk) and from Jesuit houses before the suppression of the Society of Jesus.The Chyrów library collection surpassed, by the number of volumes, their value and educational quality, all secondary schools libraries in the Austrian Partition of Poland and then those of all educational establishments in the Second Polish Republic after Poland had regained national independence in 1920.