THE VISTULA, EASTERN PRUSSIA, THE FREE CITY OF GDANSK. A tourist map of the Eastern Prussian regions along the Vistula River, with a mini-guide in German on the reverse side, circa 1936, color print, the map shows Malbork, Biała Góra, Sztum, Kwidzyn, Prabuty, Kisielice, and Gardeja, as well as flood embankments, locks, and an enclave on the German side of the Vistula containing five Polish v...