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Handwritten letter, 1 page
Handwritten letter, 2 pages, signed 'deine Barbel'
Typewritten letter, 3 pages, signed 'Barbel'
Typewritten letter, 1 page, signed 'Wally'
Typewritten letter, 3 pages
Typewritten letter, 2 pages
Typewritten letter, 1 page
Handwritten letter, 18 pages
Handwritten letter, 7 pages
Typewritten letter, 1 page
Hamburger replies to Filogamo's earlier letter with the requested references and an explanation of his findings on the large and small cells of the spinal and cranial ganglia
Typewritten letter, 1 page