Archives are the current holding institutions of sources.
|Biblioteca Narodowa (PL-Wn)|
|Biblioteka Uniwersytecka, Oddzial Zbiorów Muzycznych (PL-Wu)|
Organizations are corporate entities that have been involved in the history of a source, typically as an owner, creator, or seller.
|Biblioteka Zaluskich, Warsaw|
Sources that have had their origins in this city.