| http://www.w3.org/ns/prov#value | - resources, listings of museum and gallery exhibits, and catalogs of video and still images and other materials produced or supported by the federal government as part of the U.S. contribution to the International Polar Year (IPY) 2007-2008.Classroom Resourceshttp://www.us-ipy.gov/index.cfm?id=class---Source: Smithsonian InstitutionForces of Change Portalhttp://forces.si.edu/index.htmlNearly ever
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