Image taken from en.wiki (http://en.wikipedia.org/wiki/Image:MammothCaveNPS.jpg)

This article or image contains material based on a work of a National Park Service employee, created during the course of the person's official duties. As a work of the U.S. federal government, such work is in the public domain. See the NPS website (http://www.nps.gov/) and NPS copyright policy (http://www.nps.gov/disclaimer.htm) for more information.

• (del) (cur) 09:56, 1 January 2007 . . Quadzilla99 (Talk | contribs) . . 516×387 (23,043 bytes) (This article or image contains material based on a work of a National Park Service employee, created during the course of the person's official duties. As a work of the U.S. federal government, such work is in the public domain. See the NPS website (http:)

该图片或媒体为美国国家公园管理局雇员在执行公务时创建。作为美国联邦政府的作品，此作品在美国境内属于公有领域。更多信息请参考美国国家公园管理局网站及美国国家公园管理局版权政策。