What concepts are described in the following sentence?

"Frederick city in Frederick County, Maryland is the nearest city to the Monocacy National Battlefield which is the location of the 14th New Jersey Volunteer Infantry monument. The monument was established on 11 July 1907 and belongs to the category of historic districts in the United States."

Return the answer as pairs of triples.
Monocacy National Battlefield LOCATION Frederick County, Maryland
14th New Jersey Volunteer Infantry Monument ESTABLISHED "1907-07-11"
14th New Jersey Volunteer Infantry Monument CATEGORY Historic districts in the United States
14th New Jersey Volunteer Infantry Monument DISTRICT Monocacy National Battlefield
Monocacy National Battlefield NEAREST_CITY Frederick, Maryland