This study has presented a comprehensive overview of the properties listed on the National Register of Historic Places from Pennsylvania and Indiana. The project systematically examines what types of properties are listed on the National Register from each state. The evidence, which was compiled into an electronic database, suggests that property listings did not follow larger social trends. However, the evidence did show that certain events, such as federal legislation and federal tax credits, led to a larger number of properties to be listed at certain times. The research also proved that the State Historic Preservation Offices of Pennsylvania and Indiana have many similarities in the way properties are nominated. / Department of Architecture