U-Spatial (University of Minnesota)Political national boundaries as they were in 1939.Sources:Rand McNally Popular Maps. (1939). Rand McNally & Company acquired April 14, 2016 from http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~247200~5515267:Rand-McNally-Popular-map-of-the-Cen?sort=Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No?&qvq=q:europe%2B1939;sort:Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No;lc:RUMSEY~8~1&mi=4&trs=10Invasion Study Map of Northern and Southern Europe. (1943). J.W. Clement Company, Buffalo, N.Y. acquired April 14, 2016 from http://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~247153~5515299:Invasion-Study-map-of-Northern-Euro?sort=Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No?&qvq=q:europe%2B1939;sort:Pub_List_No_InitialSort%2CPub_Date%2CPub_List_No%2CSeries_No;lc:RUMSEY~8~1&mi=8&trs=10https://umn.maps.arcgis.com/home/item.html?id=85e35d64d67f425c94ebca45dad6568a&sublayer=4engPublicHistorical National Boundaries {1939}Web servicesWorld1939University of Minnesota