Senders: Library of Congress
- Thorvald Solberg for Library of Congress to SLC, 15 December 1904 · Washington, D.C. · UCLC34252 CU-MARK
- Thorvald Solberg for Library of Congress to SLC, 1 February 1905 · Washington, D.C. · UCLC34308 CU-MARK
- Thorvald Solberg for Library of Congress to SLC, 16 December 1908 · Washington, D.C. · UCLC38469 CU-MARK
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