Columbia subject headings:
Sheep--United States--History.
Sheep--United States.
Wool industry--United States--History.
Wool industry--United States.
Harvard subject headings:
Sheep--United States--History.
Sheep--United States.
Wool industry--United States
Wool industry--United States--History.
Princeton subject headings:
Sheep--United States--History.
Sheep--United States.
Wool industry--United States--History.
Wool industry--United States.