About 140 oral history interviews, the majority for his Maltese-Australian and Polish-Australian folklore and social history projects. Personal papers of York plus papers of the historian Michael Cigler. Also a large quantity of Maltese newspapers, student newspapers, radical pamphlets and ephemera.

About 600 books and 66 serials, mainly relating to entomology and the natural sciences. Includes works on British entomology as well as Europe, North and South America. About one-third were published in the 18th and 19th centuries.