Columbia subject headings:
Book industries and trade--Canada--Directories.
Book industries and trade--United States--Directories.
Harvard subject headings:
Bookbinders--Canada--Directories.
Bookbinders--United States--Directories.
Directories.
Printers--Canada--Directories.
Printers--United States--Directories.
Princeton subject headings:
Bookbinders--Canada--Directories.
Bookbinders--United States--Directories.
Printers--Canada--Directories.
Printers--United States--Directories.