Although initially it was not involved in the enterprise, in 1906 it took over the +39° to +32° zone for the Carte du Ciel. The zone had been originally assigned to the Potsdam Observatory whose Director, H.C. Vogel,  in 1904 decided not to even start taking the long-exposure plates.

The majority of the charts (i.e. 500) were published before 1935. The charts also indicate the plate numbers.

References: C. Bigg, La Carte du Ciel vue de Potsdam, in: La Carte du Ciel, ed. by J. Lamy, EDP Sciences, 2008, p. 142-144.

                    I. Chinnici, La Carte du Ciel, Observatoire de Paris/Osservatorio Astronomico di Palermo, 1999, p. 393-397.