Text

Hans Cloos (possibly) to Unclear, 1930s
Handwritten
Hans Spemann to Viktor Hamburger, 1933
Handwritten
G. Schmidt to Viktor Hamburger, 1972
Typewritten
Hans Spemann to Viktor Hamburger, 1927
Handwritten
Hans Spemann to Viktor Hamburger, 1935
Handwritten
Paul S. P. Shieh to Viktor Hamburger, 1951
Handwritten
M. N. Ragosina to Viktor Hamburger, 1961
Typewritten
Hans Spemann to Viktor Hamburger, 1925
Handwritten
Viktor Hamburger to Rob Oppenheim, 1993
Handwritten
G. Schmidt to Viktor Hamburger, 1959
Typewritten
Hans Spemann to Viktor Hamburger, 1927
Handwritten
Salome Waelsch to Viktor Hamburger, 1988
Typewritten

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