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Eduard Riggenbach. Das Lebensbild eines blinden Gelehrten, etc. [With a list of Riggenbach's writings and with portraits.]
- "Eduard Riggenbach : das Lebensbild eines blinden Gelehrten"
- "Eduard Riggenbach. Das Lebensbild eines blinden Gelehrten, etc. [With a list of Riggenbach's writings and with portraits.]"@en