@book{31997,
	author = {Filhol, Henri, },
	title = {Recherches sur les phosphorites du Quercy },
	publisher = {G. Masson, },
	year = {1877.},
	series = {Bibliothèque de l'Ecole des Hautes Etudes. Section des sciences naturelles ; },
	address = {Paris : }
}