@book{69796,
	author = {Leopold, Marian. and Walus, Tadeusz.},
	title = {O nawozeniu jezior /},
	publisher = {Instytut Rybactwa Srodladowego,},
	year = {1969.},
	series = {Instytut Rybactwa Srodladowego ;},
	address = {Olsztyn :}
}