The records in S-1931 contain correspondence between de Seynes, during his tenure as the Under-Secretary-General for DESA, and Secretary-Generals Dag Hammarskjöld (1954-1961) and U Thant (1961-1971). Many of these records contain correspondence between Secretary-General Hammarskjöld concerning the integration of the TAA and DESA in 1958. There are also invitations to member states requesting their attendance at meetings and congratulatory letters regarding appointments and promotions of UN personnel from de Seynes on behalf of the Secretary-General.