The manuscripts described in the Thematic Catalogue … were brought to the Metropolitan Seminary of Warmia ‘Hosianum’ Library in Olsztyn after the Second World War but they have not been widely known until now. 

Most of the manuscripts were written in the 18th century, and the less copious ones were copied in the 19th century. There is only one  part-book, recorded at the turn of the 17th century. The manuscripts have various provenances, though almost half of them originate from Dobre Miasto (German: Guttstadt), where a vocal and instrumental ensemble was active in the 18th century.