On 21 June 1935, a Federal Act was passed on the production of the new National Map series, ranging in scale from 1:25.000 to 1:1.000.000. Because of the political situation in Europe, work was started on the 1:50.000 maps. For this purpose, a 'M18d' Messerschmitt was bought for aerial photography, the first aircraft owned by the "Eidgenössischie Landestopographie". In 1938, the first 1:50.000 map was published: "263 Wildstrubel". From 1939 to 1945, all sales were suspended because of World War II. In 1939, the "Eidgenössische Landestopographie" also procured its first vehicle.