Columbia subject headings:
Harvard subject headings:
Eye--Diseases--Treatment--Congresses.
Eye--Diseases--Treatment--Switzerland--Zurich--History--Exhibitions.
Eye--Diseases--Treatment--Switzerland--Zurich--History.
Hospitals, Ophthalmic and aural--Switzerland--Zurich--History--Exhibitions.
Hospitals, Ophthalmic and aural--Switzerland--Zurich--History.
Ophthalmology--Congresses.
Ophthalmology--Switzerland--Zurich--History--Exhibitions.
Ophthalmology--Switzerland--Zurich--History.
UniversitätsSpital Zurich.
UniversitätsSpital Zurich. Augenklinik--History--Exhibitions.
UniversitätsSpital Zurich. Augenklinik--History.
Princeton subject headings:
Eye--Diseases--Treatment--Congresses.
Eye--Diseases--Treatment--Switzerland--Zurich--History--Exhibitions.
Hospitals, Ophthalmic and aural--Switzerland--Zurich--History--Exhibitions.
Ophthalmology--Congresses.
Ophthalmology--Switzerland--Zurich--History--Exhibitions.
UniversitätsSpital Zürich. Augenklinik--History--Exhibitions.