|
By Neil K. Ganju, Patrick J. Dickhudt, Ellyn T. Montgomery, Patrick Brennand, R. Kyle Derby, Thomas W. Brooks, Glenn R. Guntenspergen, Marinna A. Martini, Jonathan Borden, and Sandra M. Baldwin
View of the marsh at Blackwater National Wildlife Refuge, Maryland. Photograph by Neil K. Ganju.
U.S. Department of the Interior U.S. Geological Survey U.S. Geological Survey, Reston, Virginia: 2012 For product and ordering information: For more information on the USGS—the Federal source for science about the Earth,
its natural and living resources, natural hazards, and the environment: Suggested citation: Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. To view files in PDF format, download a free copy of Adobe Reader. |