Baedeker holding a reception at the Leipzig "Harmonie", a popular venue for such events. The firm did make some progress and he managed to produce twelve new titles in German and five in English, though these included those commissioned by the Nazi regime. He also published the 1928 one-volume eighth and revised German edition of "Egypt" and in 1929 its eighth English edition, which many travel guidebooks connoisseurs and collectors consider to be the two finest Baedeker travel guides ever published. Hans Baedeker's released 10 guidebooks in German between 1928 and 1942. Several were commissioned by the Nazis, who had been
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