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Greetings for Hamburger's 75th birthday by Heinrich & Elisabeth Meyn
Thank you letter for a record by Glenn Gould Heinrich received from Hamburger
Private letter, mainly on politics
Private letter, mainly on politics
Greetings for Hamburger's 69th birthday
Discussions about differences of NGF in developing chick embryos and in sarcomas
Brief description of the Bermuda Marine Laboratory and discussions about the significance of hyperplasia in nerve development.