AbstractDr. Janko Šlebinger is one of the most important Slovene bibliographers. During his forty years of active work, he has written numerous bibliographies: from (current) general and subject bibliographies to author bibliographies. He constituted the Slovene bibliography together with Simonič and therefore established conditions for rapid a development of the field after World War II. He was the creator of the modern Slovene bibliography, an expert bibliographer who was in line with bibliographical trends throughout the world and as such laid foundations for systematic and versatile activities in the field of bibliography writting. His most important works are the Slovene Bibliography 1907-1912 (1913) and Slovene Journals and Newspapers 1797-1936 (1937). The paper presents an assessment of Šlebinger's bibliographies from early to final works. These works are presented in chronological and subject order. Innovations and specialities introduced by Šlebinger as well as some deficiencies are emphasised.