Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Mammoth Cave National Park' has mentioned 'National Park Service' in the following places:
Occurrence Sentence Text Source
The National Park Service offers several cave tours to visitors.
According to the National Park Service, "By May 22, 1936, 27,402 acres of land had been acquired and accepted by the Secretary of the Interior.
However, this information was closely held by the explorers: it was feared that the National Park Service might forbid exploration were this known.
In March 1961, the Crystal Cave property was sold to the National Park Service for $285,000.
The Cave Research Foundation was permitted to continue their exploration through a Memorandum of Understanding with the National Park Service.
Finally, on Septemberxc2xa09, 1972, a six-person CRF team of Wilcox, Crowther, Zopf, Gary Eller, Stephen Wells, and Cleveland Pinnix (a National Park Service ranger) followed Hanson's Lost River downstream to discover its connection with Echo River in Cascade Hall of Mammoth Cave.
Designated by the U.S. Congress in 1941 as a national park, Mammoth Cave National Park is managed under the authority of the Organic Act of August 25, 1916 which established the United States National Park Service.
In addition, the National Park Service has established Management Policies which provide broader direction for all National Park Service units, including Mammoth Cave.