@misc{JSFS_1874__15__297_0,
     title = {Commerce du {Zollverein} de 1868 \`a 1872},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {297--301},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {15},
     year = {1874},
     language = {fr},
     url = {http://www.numdam.org/item/JSFS_1874__15__297_0/}
}