Columbia subject headings:
Harvard subject headings:
Bakeries--Bibliography.
Bakeries--Information services.
Flour industry--Bibliography.
Flour industry--Information services.
Flour mills--Bibliography.
Flour mills--Information services.
Princeton subject headings:
Baked products--Bibliography.
Baked products--Directories.
Flour industry--Bibliography.
Flour industry--Directories.
Flour mills--Bibliography.
Flour mills--Directories.