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National Register Information System
The National Register Information System (NRIS) is a database of properties that have been listed on the United States National Register of Historic Places. The database includes more than 84,000 entries of historic sites that are currently listed on the National Register, that were previously listed and later removed, or that are pending listing.〔(【引用サイトリンク】Introduction—Documentation )〕 The database includes approximately 45 pieces of data for each listed property. Accuracy of the NRIS database may be imperfect. For example, a 2004 paper addressed accuracy of spatial location data for part of the NRIS content.〔(【引用サイトリンク】title=Digital Conversion, Accuracy Improvement, and Product Generation for the National Register of Historic Places in West Virginia )〕
==History==
Efforts to digitize the database began as early as 1968,〔 but the database was not fully digitized until 1986. By 1994 it had come to be used in answering more than 4,000 public queries per year. As a digitized index to the National Register properties, Diane E. Miller, chief of a unit in the Interagency Resources Division of the National Park Service (NPS) was quoted as saying that the "NRIS has opened access to the National Register documentation that was not possible a decade ago.". A published article by Diane Miller describes the digitization of the NRIS database starting in the 1980s. Another article, "Computerizing the National Register of Historic Places" in ''CRM: Cultural Resources Management'' (21:4) (1998) also describes the digitization.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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