@article{JSFS_1884__25__168_0,
     author = {Block, Maurice},
     title = {Les mines et usines en {Prusse}},
     journal = {Journal de la soci\'et\'e fran\c{c}aise de statistique},
     pages = {168--172},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {25},
     year = {1884},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/JSFS_1884__25__168_0/}
}