Open access presentation of the evolution of the same series of original documents which, over time, has changed formats, materials and inks involving a constant adaptation of archivists to implement the most suitable conservatory measures to ensure the perenniality of this heritage. Examples of restorations and binders will be displayed alongside conservation materials that allow the most vulnerable documents to continue to pass through the centuries and make the City’s archival heritage sustainable, the Communauté d'agglomération and the CCAS de Bourges.