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Letter about visit
Greetings for Hamburger's 65th birthday
On his second review of the regulatin of the organizer action. On archencephalic differentiation. On his review of the genetic control of convergent extension (stretching).
Short note on NGF findings.
On finishing the last chapter of their book manuscript. Mainly private letter, sending Season's greetings and x-mas gifts.
On his upcoming visit to St. Louis.
Reply to a letter sent by Viktor Hamburger on February 1, 1982.