This collection contains a small but very significant portion of the correspondence sent and received by the Polish delegation to the League of Nations, mainly in the second half of the 1930s. The telegrams and letters relate to Poland's foreign relations during the interwar period and to its participation in the League of Nations, and serve as a good source for the study of the international tensions that led to the outbreak of World War II.

A digital copy of this entire collection is available on the Polish National Digital Archives website at Polska Delegacja przy Lidze Narodów.