Alles van: Herman Snellen
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Herman Snellen Probebuchstaben zur Bestimmung der Sehschärfe
Duits | 19 pagina's | Hermann Peters, Berlin | 1873
E-book
H. Snellen Test-types for the determination of the acuteness of vision
Engels | 6 pagina's | Williams and Norgate, London [etc.] | 1868
E-book
1873