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Date: 12/06/1857
From: A. Quetelet
To: Pierre De Decker, ministre de l'Intérieur
Date: 13/06/1857
From: George Biddell Airy, directeur de l’Observatoire royal de Greenwich
To: A. Quetelet
Date: 16/06/1857
From: Pierre De Decker, ministre de l'Intérieur
To: A. Quetelet
Date: 24/06/1857
From: A. Lebrun [?]
To: Félix Stappaerts, adjoint de Quetelet à l’Académie Royale
Date: 24/06/1857
From: Edouard Stevens, secrétaire général du Ministère de l'Intérieur
To: A. Quetelet
Date: 01/07/1857
From: Isidore Jouvenel, graveur
To: A. Quetelet
Date: 07/08/1857
From: A. Quetelet
To: Pierre De Decker, ministre de l'Intérieur
Date: 07/08/1857
From: George Biddell Airy, astronome royal (Greenwich)
To: A. Quetelet
Date: 13/08/1857
From: Christian August Friedrich Peters, directeur de l'Observatoire d'Altona
To: A. Quetelet