Columbia subject headings:
Commercial products--North America--Classification--Handbooks, manuals, etc.
Commercial products--United States--Classification--Handbooks, manuals, etc.
Industries--North America--Classification--Handbooks, manuals, etc.
Industries--United States--Classification--Handbooks, manuals, etc.
Harvard subject headings:
Commercial products--North America--Classification--Handbooks, manuals, etc.
Commercial products--United States--Classification--Handbooks, manuals, etc.
Industries--North America--Classification--Handbooks, manuals, etc.
Industries--United States--Classification--Handbooks, manuals, etc.
Princeton subject headings:
Commercial products--North America--Classification--Handbooks, manuals, etc.
Commercial products--United States--Classification--Handbooks, manuals, etc.
Industries--North America--Classification--Handbooks, manuals, etc.
Industries--United States--Classification--Handbooks, manuals, etc.