WAR OF 1870. Handwritten plan and P.S., October-November 1870. Interesting set on the balloons of the siege of Paris. Extract of the general plan of the Gare de Paris (Gare du Nord), on tracing paper, in ink and watercolor, scale 0.002, dated October 24, 1870. The plan, cut in two pieces (28,5 x 20,5 cm each), shows the different locations of the balloon construction areas and those reserved for the administration. Report established by the chief engineer of the Compagnie des Chemins de Fer du Nord addressed to Mr. DARTOIS, chief of the service of the balloonists to the Station of Paris, concerning the installation of the "Provisional stoves to be established in the station of Paris" in the room having to be used as workshop for the manufacture of the balloons (1 p. in-4, heading). One joined a n° of the Official Journal of the French Empire " Session of the Legislative body of July 6 and 8, 1870 ": THE WAR WITH PRUSSIA - ITS CAUSES.