Map of Europe that Highlights the Rhine and Danube River
A map of Europe that highlights the Rhine River, Danube River, and their "connections." Tables at the top left of the map gives "Names of Countries" and "Geographical Equivalents." An inset of the Rhine River system details its waterways and principal ports, including the amount of port traffic as of 1935 and waterway depths as of 1937. Handwriting on the back reads: "Europe, 1937."