Columbia subject headings:
Polska Akademia Nauk. Biblioteka Gdańska--Catalogs.
Vistula Marsh (Poland)--Maps--Bibliography--Catalogs.
Harvard subject headings:
Polska Akademia Nauk. Biblioteka Gdańska--Special collections--Maps--Catalogs.
Vistula Marsh (Poland)--Maps--Poland--Gdańsk--Catalogs.
Princeton subject headings: