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On references to neural crest migration.
Handwritten letter, 4 pages, signed 'Wally'
Updates about current activities
Invitation to give a seminar at the Johns Hopkins University by the Committee on Cancer Teaching and Research of the Medical School
On the proofs for their chapter in "Analysis of Development".
Private letter on Weigold's travels in the US
Typewritten letter, 1 page
On Wenger's interest in a N.I.H. fellowship.