Columbia subject headings:
Rolandus, Parmensis, active 1264.
Ruggero, Frugardo, active 12th century.
Surgery--Early works to 1800.
Harvard subject headings:
Rolandus, Parmensis, active 1264.
Ruggero, Frugardo, active 12th century
Surgery--Early works to 1800
Princeton subject headings: