@book{44757,
	author = {Helgeson, Harold C. and Brown, Thomas H.},
	title = {Handbook of theoretical activity diagrms depicting chemical equilibria in geologic systems involving an aqueous phase at one Atm and 0 ̊to 300 ̊C},
	publisher = {Freeman, Cooper},
	year = {[1969]},
	address = {San Francisco},
	note = {921004}
}