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DisabilityGuide.com
http://www.disabilityguide.com/
Disability information resource for the Maryland, Washington, DC and Virginia areas.
National Zoo and Smithsonian Biopark
http://www.fonz.org/visit.htm
Access guide for persons with disabilities
Smithsonian: Visitors with Disabilities
http://www.si.edu/visit/visitors_with_disabilities.htm
Information on the services available to visitors with disabilities.
The National Museum of American History
http://americanhistory.si.edu/youmus/disabled.htm
Services for the disabled visiting the Smithsonian.