Columbia subject headings:
Incunabula--Facsimiles--Bibliography.
Incunabula.
Printers.
Type and type-founding.
Harvard subject headings:
Incunabula--Bibliography.
Incunabula--Facsimiles--Bibliography.
Incunabula.
Printers
Printing--History--Origin and antecedents
Roman type.
Type and type-founding
Princeton subject headings:
Incunabula--Facsimiles--Bibliography.
Incunabula.
Printers.
Type and type-founding.