The Wisconsin Historic Aerial Image Finder provides free online access to over 100,000 digital aerial photographs of Wisconsin from 1936 to present. Most of the photographs were originally acquired by the US Department of Agriculture, the US Geological Survey and additional state and local government agencies. Depending on the source material, the images were digitized from contact prints or from original film rolls. Information on the scale and resolution of the imagery is included in the WHAIFinder application and in the image metadata. All photographs are available for download by any user without fee or use restrictions., Collaborators on the Wisconsin Historic Aerial Image Finder project include the Wisconsin State Cartographer’s Office, the Arthur H. Robinson Map Library, the University of Wisconsin Cartography Lab, the University of Wisconsin Digital Collections Center, and the Wisconsin Department of Transportation.