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 appeared in 1861 after Karl Baedeker's death. However, in 1836 he published "The Traveller's Manual of Conversations" in English, German, French and Italian. The 352-page book also contained many useful Dutch expressions and vocabulary. The manual was founded on the works of Boldoni, Mad. de Genlis and others, acknowledged on the title pages, which were in both English and German, unusual then, but he was an astute businessman and primarily a bookseller at the time. Unusually, too, the German page was on the left and the traditional title page on the right was in English. Whereas the German title page