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
Karl Baedeker something new (Baedeker emulated the style of English guide books published by John Murray), the inclusion of detailed information on routes, travel and accommodation was an innovation. Baedeker was always generous in acknowledging the part John Murray III had played in nurturing his outlook on the future development of his guides. As a bookseller in Koblenz, he had often seen tourists enter his bookshop, either carrying a red Murray guide or looking for one. At the time, John Murray III was the leader in the field, but Baedeker was about to change that. He is often referred to as the