00279nam a2200097   450000100070000000500170000700800360002410000220006024500820008226400170016401247220260807101700.0260101s1988    pe      000 0 eng  d1 aStephen Blanchard10aDissolved Silica in the Tidal Potomac River and Estuary, 1979-81 water years. 1aDenverc1988