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3. Application of Telephonic Interpretation during the 12th Session of the Conference File. O 304/4/12. ILO Archives, Geneva.
4. Application of Telephonic Interpretation during the 13th Session of the Conference File. O 304/4/13. ILO Archives, Geneva.
5. Application of Telephonic Interpretation during the Year 1932 (16th Session of the ILO Conference) File. O 304/4/16. ILO Archives, Geneva.