@book{9483,
	author = {Eckstein, Oskar, and Jacob, A. and Berlin (Germany).},
	title = {Arbeiten über Kalidüngung,},
	publisher = {Verlagsgesellschaft für Ackerbau,},
	year = {1931.},
	address = {Berlin,},
	note = {At head of title : Landwirtschaftliche Versuchsstation, Berlin-Lichterfelde.}
}