National Historical Parks, some National Monuments, and certain other areas listed in the National Park system are historic landmarks of national importance that are highly protected already, often before the inauguration of the NHL program in 1960, and are then often not also named NHLs per se. The National Park Service lists these together with the NHLs in the state.These are listed on p.112-113 of "National Historic Landmarks Survey: List of National Historic Landmarks by State", November 2007 version.
