Baedeker to have three of his four sons − Hans, Ernst and Dietrich − beside him in the firm, as editors and writers. Karl Baedeker III, the fourth son, entered academia and rose to become a professor of physics at the University of Jena. He was killed in action at the Battle of Liège in August 1914. It was his son Karl Friedrich who revived Verlag Karl Baedeker after the Second World War. During his reign, which lasted over 50 years, Fritz produced 73 new "Baedekers", as they came to be known universally. The Baedeker travel guides became so popular that
Baedeker victim of the post-war international geopolitical and economic conditions. Consequently, in 1920, Fritz broke with tradition and for some time thereafter, Baedeker guides to German cities and regions carried a limited amount of advertising. Fritz Baedeker's released 39 guidebooks in German from 1872 to 1925, and 21 in English from 1872 to 1914. Twelve French titles were published between 1882 and 1910. 1925−1943: Hans Baedeker (1874−1959), the eldest son of Fritz Baedeker, took charge of the company in difficult times. His two brothers, Ernst and Dietrich, were with him, running the company. The firm had lost heavily by investing in