Series contains reference materials, manuscripts, telegrams, and notes of conversation related to topics and events prior to 1931, dating between 1906 and 1931. The reference materials include Wellington Koo's oral history transcripts on his family and education background as well as documents written by others relating to the history of the Paris Peace Conference (1919) and the Washington Conference (1921-1922). The highlights of the series consist of telegrams in Chinese exchanged between the Chinese Delegation, China's Ministry of Foreign Affairs, and other organizations in China during the Paris Peace Conference in 1919. The notes of conversation document the meetings from between Wellington Koo and other Foreign Ministers to China from November to December of 1931 during the time when Koo was the Minister of Foreign Affairs. Additional papers prior to the Mukden Incident of 1931, as noted by Wellington Koo, were left in Tianjin, China. Papers were later housed in the Second Historical Archive of China in Nanjing (中國南京第二歷史檔案館). Materials related to his personal life prior to 1931 may also be found in Series X: Personal.