Columbia subject headings:
Clinics--United States--Directories.
Dental laboratories--United States--Directories.
Medical instruments and apparatus industry--United States--Directories.
Medical laboratories--United States--Directories.
Pharmaceutical industry--United States--Directories.
Harvard subject headings:
Clinics--United States--Directories.
Dental instruments and apparatus industry--United States--Directories.
Dental laboratories--United States--Directories.
Health facilities--United States--Directories.
Medical instruments and apparatus industry--United States--Directories.
Medical laboratories--United States--Directories.
Medical supplies industry--United States--Directories.
Pharmaceutical industry--United States--Directories
Princeton subject headings: