Correspondence
Handwritten letter to Viktor Hamburger
Luftpostleichtbrief (german Air Mail letter) to Martha and Viktor Hamburger
Typewritten letter, 1 page, signed 'Wally'
Typewritten letter, 2 pages, signed 'Wally'
Hamburger's sponsorship of Anne Bekoff's Alfred P. Sloan Research Fellowship and request for Betz to write a letter of support
Recommendation letter of Anne Bekoff for a Sloan Fellowship for Basic Research
Typewritten letter, 1 page
Thank you letter regarding an image of Karl von Frisch Hamburger sent to Lindauer
Typewritten letter, 1 page, Luftpostleichtbrief (german Air Mail letter), regarding moving to Bremen with her children
Luftpostleichtbrief (german Air Mail letter) regarding Martha Hamburger and Annelise's children being sick
Luftpostleichtbrief (german Air Mail letter) letter to Viktor Hamburger
Typewritten letter, 1 page, signed 'Wally'