We are pleased to inform you that "Mappa's handwritten atlas of the Bialski County with farms and villages belonging to it belong to the goods of the Enlightened Father JMC Hieronim Radziwiłł [...] from the geometric dimension drawn up in 1781" [by Leonard Targoński], commonly known as the Radziwiłł Atlas, resources of the Scientific Society of Płock, has been entered on the Polish List of the UNESCO National Program "Memory of the World".