The Mission of the Department of the Interior is to protect and provide access to our Nation's natural and cultural heritage and honor our trust responsibilities to Indian Tribes ...
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http://dictionary.reference.com/browse/Interior

In general, the interior of something refers to the space or part inside of it, excluding any kind of wall or boundary around its outside. Commonly referenced interiors are those ...
http://en.wikipedia.org/wiki/Interior

In mathematics, the interior of a set S consists of all points of S that are intuitively "not on the edge of S". A point that is in the interior of S is an interior point of S.
http://en.wikipedia.org/wiki/Interior_%28topology%29

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