General Secretariat: correspondence (1961-early 1962); correspondence with board members: Charles E. Odegaard, Ronald Syme, Silvio Zavala, Felice Battaglia, Jules Marouzeau, Hans R. Hahnloser, R.N. Dandekar, Kazimir Kumaniecki
General Secretariat: correspondence with members of the bureau (1962): Charles E. Odegaard, Ronald Syme, Silvio Zavala, Felice Battaglia, Jean d'Ormesson, Hans R. Hahnloser, Tetsuro Yamamoto, Kazimir Kumaniecki
General Secretariat: correspondence with members of the Bureau (1964): Charles E. Odegaard, Ronald Syme, Silvio Zavala, Hans R. Hahnloser, Tetsuro Yamamoto, Kazimir Kumaniecki, C.C. Berg, Jean d'Ormesson; general correspondence
General Secretariat: correspondence with members of the Bureau (1965): Charles E. Odegaard, Ronald Syme, Silvio Zavala, Hans R. Hahnloser, Tetsuro Yamamoto, Kazimir Kumaniecki, C.C. Berg, Jean d'Ormesson, Jaroslav Prusek; general correspondence
General Secretariat: correspondence with members of the Bureau (1966): Ronald Syme, Silvio Zavala, Hans R. Hahnloser, Tetsuro Yamamoto, C.C. Berg, Jean d'Ormesson, Jaroslav Prusek, Rensselaer W. Lee; general correspondence
General Secretariat: correspondence with the members of the Bureau (1967): Ronald Syme, Silvio Zavala, Hans R. Hahnloser, Tetsuro Yamamoto, C.C. Berg, Jean d'Ormesson, Jaroslav Prusek, Rensselaer W. Lee, Ali Akbar Siassi
General Secretariat: correspondence with the members of the Bureau (1969): Ronald Syme, Silvio Zavala, Hans R. Hahnloser, C.C. Berg, Jean d'Ormesson, Jaroslav Prusek, Rensselaer W. Lee, Ali Akbar Siassi
General Secretariat: correspondence with the members of the Bureau (1970): Ronald Syme, Silvio Zavala, Hans R. Hahnloser, Jean d'Ormesson, Jaroslav Prusek, Ferdinand N'Sougou Agblemagnon
General Secretariat: correspondence with the members of the Bureau (1971): Rensselaer W. Lee, Ronald Syme, Silvio Zavala, Hans R. Hahnloser, Ali Akbar Siassi, Jean d'Ormesson, Jaroslav Prusek, Ferdinand N'Sougou Agblemagnon, Ignacio Bernal; correspondence "political issues"
General Secretariat: correspondence with the members of the Bureau: Charles E. Odegaard, Ronald Syme, Silvio Zavala, Felice Battaglia, Hans R. Hahnloser, Tetsuro Yamamoto, Kazimir Kumaniecki, C.C. Berg; general correspondence
General Secretariat: correspondence with the officers and organisers of the General Assembly (1959): Charles E. Odegaard, Ronald Syme, Silvio Zavala, Felice Battaglia, Jules Marouzeau, Hans R. Hahnloser, Emilio Garcia Gomez, R.N. Dandekar, Albert H. Marckwardt, Carsten Hoeg
