| Results | |||
| Note: A ? indicates the information presented is a 'best guess'. The information on the original letter is unknown or illegible and may not be completely accurate. | |||
| Letter Number | Letter Date | Written By | Written To |
| Unknown | John Gunther | Carman Barnes | |
| 1937 May 17 | John Gunther | Carman Barnes | |
| 1937 July 02 | John Gunther | Carman Barnes | |
| 1940 June 12 | John Gunther | Carman Barnes | |
| Unknown | John Gunther | Carman Barnes | |
| Unknown | John Gunther | Carman Barnes | |
| Unknown | John Gunther | Carman Barnes | |
| Unknown | John Gunther | Carman Barnes | |
| Unknown | John Gunther | Carman Barnes | |
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