@article{JSFS_1923__64__328_0,
     author = {Bel, J.-M.},
     title = {Les gisements de phosphate du {Maroc}},
     journal = {Journal de la Soci\'et\'e de statistique de Paris},
     pages = {328--333},
     publisher = {Soci\'et\'e de statistique de Paris},
     volume = {64},
     year = {1923},
     language = {fr},
     url = {http://archive.numdam.org/item/JSFS_1923__64__328_0/}
}