Columbia subject headings:
Harvard subject headings:
Donders, F. C. (Franciscus Cornelis), 1818-1889--Correspondence.
Donders, F. C. (Franciscus Cornelis), 1818-1889--Friends and associates.
Graefe, Albrecht von, 1828-1870--Correspondence.
Graefe, Albrecht von, 1828-1870--Friends and associates.
Ophthalmologists--Correspondence.
Ophthalmologists--Germany--Correspondence.
Ophthalmologists--Netherlands--Correspondence.
Ophthalmology--History--19th century.
Princeton subject headings:
Donders, F. C. (Franciscus Cornelis), 1818-1889.
Graefe, Albrecht von, 1828-1870--Correspondence.
Ophthalmologists--Correspondence.
Ophthalmology--History--19th century.