Correspondence
On Hamburgers paper on Mitotic Pattersn in the Chick Spinal Cord.
Private letter of condolence. On the death of Hamburger's father. Letter also signed by Gertrud.
Response from Holtfreter on zipper theory of tissue folding
Requesting Hamburger's opinion about possible visiting professors for Columbia University
Letter on scientific research from a university in Oslo, Norway
resume
Typed letter, 2 pages
Handwritten letter, 2 pages
Typewritten letter, 1 page
Typewritten letter, 1 page