12 Sep 1939, Page 20 – The Sheboygan Press at Newspapers.com
The US Forest Service collected fire data from at least 1916 to 2008, which showed that burn acreage is down 80% since the 1930s.
2010-sustainability-report.pdf
This 1938 New York Times article confirmed the data in Forest Service graph.
TimesMachine: October 9, 1938 – NYTimes.com
National Interagency Fire Center
National Interagency Fire Center
Burn acreage in the US is down 95% since the preindustrial era.