University of MichiganNichols Arboretum - Historical Aerial Imagery (1949). The source of this imagery is unknown.ArcGIS ImageMapLayerhttps://hub.arcgis.com/datasets/124d16af726641c3adff9427fcb49e63engUM Matthaei Botanical Gardens and Nichols ArboretumPublicNichols Arboretum - Historical Aerial Imagery (1949) [Michigan]Web servicesMichigan1949