@book{243805,
	author = {Van Zeist, Willem and Wasylikowa, Krystyna},
	title = {Progress in old world palaeoethnobotany : a retrospective view on the occasion of  20 years of the International Work Group for Palaeoethnobotany},
	publisher = {A. a. Balkema},
	year = {1991},
	address = {Rotterdam}
}