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The top level of Recreation/Pets/Dogs is for sites that provide a broad source of information about all aspects of dogs and dog ownership. This is not for sites selling products or for local dog related businesses such as boarding or grooming services.
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Roller Coaster Physics
http://ffden-2.phys.uaf.edu/211_fall2002.web.dir/Shawna_Sastamoinen/Roller_Coasters.htm