Karl Baedeker Tirol und Salzburg, Oberitalien 1855: Paris und Umgebung. nebst Rouen, Havre, Dieppe, Boulogne und den Eisenbahn-Strassen vom Rhein bis Paris 1859: La Hollande et la Belgique 1860: Allemagne et quelques parties les pays limitrophes jusqu'à Strasbourg, Metz, Luxembourg, Coprnhague, Cracovie, Bude-Pesth, Venise, Milan, etc. From the beginning, Baedeker realised the importance of including quality, reliable maps in his travel guides, which were black-and-white initially. To this end, he engaged the services of Eduard Wagner of Darmstadt, a specialist in cartography, and the maps he produced for Baedeker were way ahead of the times. The first Baedeker travel guide in English
Karl Baedeker (scientist) This was the first example of doping a semiconductor to change its properties and also the discovery of transparent conductive materials. He also observed a Hall effect in transparent copper iodide thin films that had the reverse sign to that in copper, an observation of what was later to be known as conduction by electron holes in semiconductors. This observation was critical in developing the theory of electron conduction in solids. Along with his graduate student Karl Steinberg, Baedeker studied the effect of varying concentration of iodine on the electrical properties of copper iodide. He also is credited with making