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National Historic Landmarks Program

The NHL Program makes a distinction between resources which are “contributing” and those that are “non-contributing.”
A contributing building, site, structure, or object adds to the historical associations, historic architectural qualities, or archeological values present during the period of national significance, relates to the documented significance of the property, and possesses a high degree of historical integrity.
A noncontributing building, site, structure, or object was not present during the period of significance, or it does not relate to the documented national significance of the property. Due to alterations, disturbances, additions, or other changes, it no longer possesses a high degree of historical integrity. If resources listed in the National Register of Historic Places at the state or local significance are included in the NHL nomination, they should be counted as non-contributing resources for the purpose of the NHL nomination.
Please note: the majority of resources within an NHL should be contributing.
Click here for examples.
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photograph by Conor Dupre-Neary via Flickr |




