Rock Creek Conservancy.  2013.  The Rock Creek Watershed.

Rossell Jr. CR, Patch S, Salmons S.  2007.  Effects of deer browsing on native and non-native vegetation in a Mixed Oak - Beech Forest on the Atlantic Coastal Plain. Northeastern Naturalist. 14(1):61-72

Schaetzl RJ, Anderson S.  2005.  Soils: genesis and geomorphology.

Schlarbaum S, Hebard F, Spaine P, Kamalay J.  1997.  Three American tragedies: chestnut blight, butternut canker, and Dutch elm disease. In: Britton, Kerry O., ed. Proceedings, exotic pests of Eastern forests; 1997 April 8-10; Nashville, TN. Tennessee Exotic Pest Plant Council: 45-54

Schmalzer PA, DeSelm HR.  1982.  Vegetation, endangered and threatened plants, critical plant habitats and vascular flora of the Obed Wild and Scenic River. Two Volumes.

Schuster J, Nixon PL.  2008.  Focus on Plant Problems: Gypsy Moth.

Seymour RS.  2004.  Dynamics and precision of thermoregulatory responses of eastern skunk cabbage Symplocarpus foetidus. Plant, Cell and Environment. 27:1014-1022

Shosteck R.  1976.  Periods of flowering of common flowers, trees and shrubs of Rock Creek Park, Washington, D.C. Unpublished flyer used at the Nature Center in Rock Creek Park.

Shreve E.  1910.  The ecological plant geography of Maryland; coastal zone; eastern shore district.

Smith TL.  1983.  Natural ecological communities of Pennsylvania. Draft, revised 1991.

Smith H.  1976.  Soil survey of District of Columbia. Scale: 1:12,000.

Smithsonian-National-Zoological-Park.  2008.  Migratory Bird Center: Rock Creek Park. May 15, 2008, slideshow.

Soil-and-Water-Conservation-Society.  2000.  Soil biology primer. Revised edition.

Soil-Conservation-Service.  1987.  Soil survey of Nassau County, New York. USDA Soil Conservation Service.

Southworth S.  2008.  Geology of the Chesapeake and Ohio Canal National Historical Park and Potomac River Corridor, District of Columbia, Maryland, West Virginia, and Virginia.

Southworth S, Denenny D.  2006.  Geologic map of the National Parks in the National Capital Region, Washington, D.C., Virginia, Maryland, and West Virginia. Geological Survey Open-File Report 2005-1331, available only online.

Spilsbury G.  2003.  Rock Creek Park.

Stewart KG, Roberson MR.  2007.  Exploring the geology of the Carolinas.

Sullivan J.  1994.  Carpinus caroliniana. In: Fire Effects Information System, [Online].

Tennessee-Division-of-Natural-Heritage.  Submitted.  Unpublished data.

THE CULTURAL LANDSCAPE FOUNDATION.  2006.  Dumbarton Oaks Park: Farrand’s garden in the valley.

The National Park Service Biodiversity Database.  2014.  NPSpecies - The National Park Service Biodiversity Database. Secure online version.

The Nature Conservancy, Sweet Water Trust.  2004.  Determining the size of eastern forest reserves.

The Nature Conservancy.  1998.  Vegetation classification of Rock Creek Park.

The-Owl-Pages.  2008.  Barred Owl - Strix varia.