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I removed the "super" categories Category:Landmarks of the United States and Category:National Natural Landmarks of the United States because 1) National Wildlife Refuges are not necessarily "landmarks" in the sense of a building or a mountain; and 2) NNLs require a specific official designation by the National Park Service. Of course, it's possible for some overlap to occur, I think that should be addressed in categorizing individual articles. Cuppysfriend 00:50, 28 February 2006 (UTC)[reply]