@book{18837,
	author = {Ferguson, David K.},
	title = {The Miocene flora of Kreuzau, Western Germany.},
	publisher = {Noord-Hollandsche U.M.,},
	year = {1971-},
	series = {Verhandelingen der Koninklijke Nederlandse Akademie van Wetenschappen, Afd. Natuurkunde. Tweede reeks ;},
	address = {Amsterdam,},
	note = {Summaries in English, French and German.}
}