On 20 March 1957, René Mayer, President of the High Authority of the European Coal and Steel Community (ECSC), forwards to Paul-Henri Spaak, Belgian Foreign Minister and President of the Intergovernmental Conference on the Common Market and Euratom, a letter in which he informs him of the position taken by the High Authority on the powers and responsibilities of the new institutions provided for by the Treaties establishing the European Economic Community (EEC) and the European Atomic Energy Community (EAEC or Euratom).

Paul-Henri Spaak (on the left), President of the Common Assembly of the European Coal and Steel Community (ECSC), and Jean Monnet, President of the ECSC High Authority, in Strasbourg in January 1953.

Le 15 août 1952, Sforza Galeazzo Sforza, Secrétaire du Cabinet de Jacques Camille Paris, se rend à Luxembourg pour remettre deux lettres de la part du Secrétaire général du Conseil de l’Europe au président de la Haute Autorité de la CECA. Dans un compte-rendu du 18 août, il expose ses conversations avec les membres du Cabinet de Jean Monnet au sujet de l’organisation de la première session de l’Assemblée de la CECA à Strasbourg.

Discussion between François de Menthon, President of the Consultative Assembly of the Council of Europe (on the left), and Jean Monnet, President of the High Authority of the European Coal and Steel Community (ECSC), in Strasbourg on 10 January 1953.

Ansprache des Präsidenten der Hohen Behörde, Jean Monnet, anlässlich der Tagung des Besonderen Ministerrates der EGKS am 2. Februar 1953.

Am 10. August 1952 eröffnet Jean Monnet in Luxemburg die konstituierende Sitzung der Hohen Behörde der Europäischen Gemeinschaft für Kohle und Stahl (EGKS) mit einer Rede, in der er die ehrgeizigen Zielsetzungen für die EGKS und die Hohe Behörde erläutert.

Max Kohnstamm, Secretary of the High Authority of the European Coal and Steel Community (ECSC) from 1952 to 1957, outlines the changes made to Europe’s economic and political structures as a result of the Schuman Plan.

Le 21 décembre 1954, Duncan Sandys, membre du gouvernement britannique, adresse à Jean Monnet, président de la Haute Autorité de la CECA, une lettre relative à la composition du futur Conseil permanent d'association entre la CECA et le Royaume-Uni.

On 10 January 1953, Jean Monnet (left), President of the ECSC High Authority, and Lord Layton (right), British observer, hold talks on the margins of a meeting of the ad hoc Assembly for a European Political Community (EPC).

Franz Etzel, former Vice-President of the High Authority of the European Coal and Steel Community (ECSC) and Member of the Committee of Three Wise Men which, in May 1957, published its report entitled ‘A target for Euratom’.