@article{JSFS_1886__27__162_0,
     author = {Keller, O.},
     title = {La production min\'erale des {\'Etats-Unis}},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {162--173},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {27},
     year = {1886},
     language = {fr},
     url = {http://www.numdam.org/item/JSFS_1886__27__162_0/}
}