"Potomac River Estuary." . . . . . . . . . . . . . "Data on distribution and abundance of submersed aquatic begetation in the tidal Potomac River and transition zone of the Potomac Estuary, Maryland, Virginia, and the District of Columbia, 1983-1984"@en . . . "Data on the distribution and abundance of submersed aquatic vegetation in the tidal Potomac River and transition zone of the Potomac Estuary, Maryland, Virginia, and the District of Columbia, 1983 and 1984"@en . . . "Data on the distribution and abundance of submersed aquatic vegetation in the tidal Potomac River and transition zone of the Potomac Estuary, Maryland, Virginia, and the District of Columbia, 1983-1984"@en . . . . . .