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Total number of records: 2
Sender: Challenger, Frederick, Professor
Recipient: Thomson, David Cleghorn
Letters: 1
Date(s): 4 Feb 1939
Location: SC MS 415/158
Sender: Thomson, David Cleghorn
Recipient: Challenger, Frederick, Professor
Letters: 6
Date(s): 3 Nov 1938 - 16 Jun 1939
Location: SC MS 415/141, 148, 151, 158