@book{43236,
	author = {Sadosvski, Alexander N. and Bie, Stein W. and Meeting of the ISSS Working Group on Soil Information systems (2 : 1977 : Varna},
	title = {Development in soil information systems},
	publisher = {Centre for Agricultural Publishing and Documentation,},
	year = {1978},
	address = {Wageningen :}
}