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This site hosts an online community for persons with XP and similar light sensitivity disorders . If you don't have the required Adobe Acrobat Reader , click here to download. This booklet, prepared by the National Institutes of Health, provides information about XP written in plain English. XP Society, Inc. is located in New York's beautiful Hudson Valley. See what we mean, visit Enjoy the Hudson Valley and The Greater Poughkeepsie Area Directory Friends of the XP Society Hudson Valley Bassmasters - whose youth project, Hudson Valley Junior Bassmasters, volunteer for Camp Sundown.