Throughout the duration of his tour, Spencer sent many letters and postcards to his parents, who he kept up to date on his itinerary and thoughts. From within the Soviet Union, Spencer sent two postcards听and two letters. A particularly interesting letter addressed to Spencer is also transcribed below.
| 颁辞谤谤别蝉颅辫辞苍诲别苍肠别 | Sender | Recipient | Date Sent/鈥婻eceived |
|---|---|---|---|
| Postcards | H. Spencer Clark | John Clark and Esther Louisa Alexander | July 25 and 31, 1931 |
| Written Letter | H. Spencer Clark | John Clark and Esther Louisa Alexander | August 1, 1931 |
| Written Letter | H. Spencer Clark | John Clark and Esther Louisa Alexander | August, 1931 |
| Typed Letter | W. Purser | H. Spencer Clark | October 31, 1931 |
