Analysis of information sources in references of the Wikipedia article "List of areas in the United States National Park System" in English language version.
Click on Park Acreage Reports (1997 – Last Calendar/Fiscal Year), then select By Park, Calendar Year, <choose year>, and then click the View PDF Report button – the areas used here are the Gross Area Acres which are in the final column of the report
Click on Park Acreage Reports (1997 – Last Calendar/Fiscal Year), then select By Park, Calendar Year, <choose year>, and then click the View PDF Report button – the areas used here are the Gross Area Acres which are in the final column of the report