On 12 July 1950, in connection with the negotiations on the Schuman Plan, the Head of the Luxembourg delegation, Albert Wehrer, sends a letter to Joseph Bech, Luxembourg Foreign Minister, in which he stresses that it is important for Luxembourg to be a candidate for the seat of the institutions of the future European Coal and Steel Community (ECSC).

On 30 October 1950, Albert Wehrer, Luxembourg diplomatic representative in Bonn, sends a report to Joseph Bech, Luxembourg Foreign Minister, in which he outlines the procedure that should be followed so that Luxembourg will be in a favourable position regarding the question of the seat of the institutions of the Coal and Steel Community.

On 11 June 1951, Peter Zimmer, Mayor of Saarbrücken, sends a letter to Robert Schuman, Chairman of the Conference on the European Union of Coal and Steel, in which he proposes that Saarbrücken be chosen as the seat of the Community institutions.

On 30 January 1952, Charles Frey, Mayor of the City of Strasbourg and President of the Temporary Strasbourg Committee for the European Movement, informs Jacques-Camille Paris, Secretary-General of the Council of Europe, that he is willing to propose Strasbourg as the seat of the European institutions.

On 25 February 1952, the Strasbourg City Council, chaired by the Mayor, Charles Frey, President of the Temporary Strasbourg Committee for the European Movement, emphasises the benefits to be derived from the selection of Strasbourg as the seat of the institutions of the European Coal and Steel Community (ECSC).

In seinen Erinnerungen schreibt Jean Monnet über die Gründe, die zur Entscheidung für Luxemburg als Sitz der Organe der EGKS führten.

In seinem Tagebuch kommentiert Herbert Blankenhorn, außenpolitischer Berater von Konrad Adenauer im deutschen Außenministerium und Botschafter der BRD bei der NATO von 1955 bis 1959, die Sitzung, die am 23. und 24. Juli 1952 in Paris zur Saarfrage und zur Frage des Sitzes der EGKS-Organe stattfand.

Am 25. Juli 1952 beschreibt die Luxemburger Tageszeitung Luxemburger Wort die bewegte Debatte, in der sich die Sechs letztendlich für Luxemburg als vorläufigen Sitz für die Institutionen der europäischen Gemeinschaft für Kohle und Stahl (EGKS) entschieden haben.

Am 27. Juli 1952 gibt der luxemburgische Außenminister Joseph Bech eine Pressekonferenz zur Umsetzung des Schuman-Plans und zur Frage des Sitzes der EGKS-Organe.

Die Bewohner Saarbrückens bereiten sich auf eine mögliche Einrichtung der Organe der Europäischen Gemeinschaft für Kohle und Stahl (EGKS) in ihrer Stadt vor: „Anpassen! Anpassen, heißt jetzt die Parole!“

Die endgültige Entscheidung über den Sitz der Organe der Europäischen Gemeinschaft für Kohle und Stahl (EGKS) bleibt lange offen. Der Karikaturist der Satirezeitschrift Der Tintenfisch ist der Ansicht, dass man sich auf alle Eventualitäten vorbereiten sollte: „Unter gewissen Umständen hätte der Bund Bildender Künstler, Abtlg. Bildhauer, Ihrer Stadt ein interessantes Angebot zu machen …“

On 26 May 1954, at a meeting held in the presence of a large number of Belgian MPs, the City of Brussels Tourist Information Office argues for Brussels to be selected as the capital city of the European Community.

On 29 June 1954, the City of Liège officially submits its application to become the seat of the High Authority of the European Coal and Steel Community (ECSC), setting out in a dossier its arguments and the support given to these arguments by an international college of town planners.

On 23 June 1954, the City of Liège sends an open letter to the Belgian Government in which it submits its application to become the seat of the European Coal and Steel Community (ECSC).

In the summary record of its meeting of 26 November 1954, the Permanent Committee for Consultation on Foreign Policy of the Benelux countries expresses its opposition to the Franco-German bilateral arrangement to transfer the ECSC’s seat to the City of Saarbrücken.

This internal note from the Luxembourg Foreign Ministry dated 14 December 1954 describes the negotiations on the seat of the ECSC which took place at the Conference of Ministers in Paris during the night of 25 to 26 July 1952.

On 31 January 1957, Lambert Schaus, Luxembourg Ambassador to Brussels, sends a letter to Joseph Bech, Prime Minister and Foreign Minister, in which he reviews the positions of the ECSC Member States on the question of the seat of the European institutions.