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Date: 07/07/1849
From: Arsène Beaulieu, mécanicien
To: A. Quetelet
Date: 30/07/1849
From: Heinrich Von Dieck, mécanicien
To: A. Quetelet
Date: 27/09/1849
From: Adolphe Nerenburger
To: A. Quetelet
Date: 02/10/1849
From: A. Quetelet
To: Charles Rogier, ministre de l'Intérieur
Date: 19/10/1849
From: Joseph Plateau, physicien
To: A. Quetelet
Date: 19/10/1849
From: Charles Rogier, ministre de l'Intérieur
To: A. Quetelet
Date: 21/10/1849
From: A. Quetelet
To: Charles Rogier, ministre de l'Intérieur
Date: 21/10/1849
From: Henri Stockman, sous-ingénieur des Ponts et Chaussées, (futur) aide à l’Observatoire
To: A. Quetelet
Date: 21/10/1849
From: A. Quetelet
To: Charles Rogier, ministre de l'Intérieur