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**Past:** mostly paper collection.

**Transition:** from 2015 gradual evolution to digital collections. Several digitization projects are ongoing and cover specific contents.

**Future:** from a knowledge base (Archives, Library catalogues, collections) to a knowledge network.

**United Nations Depository Library System:**

Dag Hammarskjöld Library at the United Nations Headquarters in New York, Geneva Library and Archives at the UNOG, United Nations Office in Geneva, 350 Depository Libraries in the world

Counselling, training and sharing (Official records, Open access periodicals, training and promotional materials, bibliographic data).

Local Depository librarians' skills and up to seventy-five years' experience.

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By means of Open access instruments and United Nations Digital Library's pivotal role.