TY - RPRT TI - Distribution and abundance of submersed aquatic vegetation in the tidal Potomac River and upper Potomac Estuary, Maryland, Virginia, and the District of Columbia, 1993-1998 AU - H. Ruhl AU - N. B. Rybicki AU - J. T. Reel AU - Virginia Carter PY - 1999 DO - 10.3133/ofr99233 UR - https://pubs.usgs.gov/publication/ofr99233 ID - ofr99233 ER -