2.
Letter 1891-02-26, Praha
Hering, Karl Ewald Konstantin, 1834-1918 (author)
Hess, Carl von, 1863-1923 (associated name)
Helmholtz, Hermann Ludwig Ferdinand von, 1821-1894 (associated name)
letter
1891-02-26
Waller Ms de-02229 Waller - German/Austrian Collection
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