Michigan Department of Natural Resources. (2016). Aerial Survey 2014 Severity: Michigan. Michigan DNR. http://gis-midnr.opendata.arcgis.com/datasets/83f5a009d001473f8cd5b876b7d739ee_42

Available from: https://geo.btaa.org/catalog/83f5a009d001473f8cd5b876b7d739ee_42