The proposed volume of the Index contains an abstract description of the second half of the materials of the Vengerov collection, covered in the alphabet of the names of compilers of autobiographical and bio-bibliographic information by letters "M" - "I" (about 1900 numbers). Thus, the reader gets access to the data bank of this collection as a whole (the boundaries of the first volume are delineated by the letters "A" - "L"). As part of the 2nd volume - the section "Iconoteck Index" of the Wenger collection with information on the presence and location of materials of the portrait collection, which was formed in parallel with the autobiographical collection. The book is equipped with auxiliary "keys" (including an alphabet of names) to the entire work (vols. 1-2). In its final form, this publication can provide significant assistance to a modern researcher in his source studies. The index can be useful to historians of science, Russian literature and social thought, university teachers, students and all curious readers.