Karl May's relationship with the lexicographer, publisher, editor, and printer Joseph Kürschner (1853 - 1902) was of great significance for the literary career of the Saxon storyteller. This volume comprehensively documents and comments on the correspondence between May and Kürschner for the first time, based on the latest research. Included are letters from and to the Stuttgart publisher Wilhelm Spemann (1844 - 1910), in whose boys' magazine "Der Gute Kamerad" Karl May's major youth stories such as "The Treasure in the Silver Lake" and "The Oil Prince" were published starting in 1887. The Union Deutsche Verlagsgesellschaft, co-founded by Spemann, later also released the first book editions of these works. Joseph Kürschner was Spemann's most important collaborator from 1880 to 1889.