Columbia subject headings:
Early printed books--Great Britain--Bibliography--Union lists.
Early printed books--Union lists.
English imprints--Union lists.
Incunabula--Bibliography--Union lists.
Incunabula--Great Britain--Bibliography--Union lists.
Union catalogs--Great Britain.
Union catalogs--United States.
Harvard subject headings:
Early printed books--Great Britain--Bibliography--Union lists.
English imprints--Union lists.
Incunabula--Great Britain--Bibliography--Union lists.
Union catalogs--Great Britain
Union catalogs--United States
Princeton subject headings:
Early printed books--Union lists.
English imprints--Union lists.
Incunabula--Bibliography--Union lists.
Union catalogs--Great Britain.
Union catalogs--United States.