@book {612,
	title = {Etudes sur le terrain houiller de Commentry. Livre Deuxi{\`e}me. Flore Fossile},
	year = {1888},
	pages = {742},
	url = {http://www.archive.org/details/tudessurleterra00boulgoog},
	author = {Renault, B.M.M. and Zeiller, R.}
}
