IDNR documentation states - ������This dataset contains point locations of sites in Indiana that have been included in the Indiana Historic Sites and Structures Inventory (IHSSI). It includes buildings, districts, sites, structures and objects that are were at least 40 years old at the time of survey. It is not complete, may be inaccurate, and may be modified as new information is prepared. The absence of information in a particular location does not necessarily indicate that no such resources exist in said location. Absence of information in a particular location may be due simply to a lack of survey investigations of said location.������
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