Columbia subject headings:
Classification--Books--Handbooks, manuals, etc.
RVK classification--Handbooks, manuals, etc.
Harvard subject headings:
Classification--Books--Handbooks, manuals, etc.
RVK classification--Handbooks, manuals, etc.
Princeton subject headings:
Classification--Books--Handbooks, manuals, etc.
RVK classification--Handbooks, manuals, etc.