Columbia subject headings:
Harvard subject headings:
Biography
Helfreich, Friedrich Christian, 1842-1927
Ophthalmologists--Germany--Würzburg--Biography.
Ophthalmology--Germany--History.
Würzburg (Germany)
Princeton subject headings:
Helfreich, Friedrich Christian, 1842-1927.
Ophthalmologists--Germany--Würzburg)--Biography.
Ophthalmology--Germany--History.