Columbia subject headings:
Horses--Diseases--Early works to 1800.
Horses--Early works to 1800.
Harvard subject headings:
Horses--Diseases--Early works to 1800.
Horses--Early works to 1800.
Princeton subject headings:
Horses--Diseases--Treatment--Early works to 1800.
Horses--Early works to 1800.
Veterinary medicine--Early works to 1800.