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Acknowledgments Description of study area, Methods References APPENDIXES Appendix A. Hydrilla vertici1lata distribution maps Appendix B. Hydrilla verticillata biomass data Appendix C. Hydrilla verticillata tubers Appendix D. Competition grid data Appendix E. Salinity studies 7 10 14 16 24

Hydrilla verticillata in the tidal Potomac River, Maryland, Virginia, and the District of Columbia, 1983 and 1984