Papers cover all aspects of Paul Langevin's life: lecture notes taken at Ecole de physique et chimie and Ecole normale supřieure; manipulation sheets for Professor Boutry's course at the Sorbonne; notes on lectures given at the Ecole normale supřieure de jeunes filles de Sv̈res, at the Ecole de physique et chimie, at the Collg̈e de France; documents on the organization and other affairs of the Ecole de physique et de chimie; documents on congresses: congress of physics, Paris (1900), Saint-Louis (1904), Solvay (1921-1948); scientific correspondence with Albert Einstein and Joliot, incoming correspondence (sorted alphabetically, by scientists); personal correspondence (sorted chronologically); scientific works, publications, manuscript working notes, calculations (sorted chronologically), patents; documents on his political life: participation on the "Ligue franȧis des droits de l'homme," relations with the Soviet Union, mission in China, presidency of the world committee against fascism, presidency of "Radio Libert,̌" association of "Tľǧraphie san fil" listeners; imprisonment at the Sant ̌and house arrest at Troyes (1940-1944); member of the parisian liberation committee; documents on the educational reform and Langevin-Wallon commission; articles on Paul Langevin; posthumous homages and condolences; celebration of Paul Langevin's centenary.