LTPagrindinis kiekvienos bibliografijos tikslas - suteikti tyrinėtojui informaciją, reikalingą užsibrėžtam tikslui pasiekti ar uždaviniui išspręsti. Jau XIX a. Joachimas Lelevelis reikalavo šakinės bibliografijos specializacijos, teigė, kad bibliografas ne tik turi gerai išmanyti savo darbo metodiką, bet ir privalo turėti specialų kurios nors mokslo srities pasirengimą. Tad kas galėjo geriau parengti istorijos bibliografiją, jei ne žmogus, mylintis ir išmanantis knygas, istorijos mokslą ir šaltinius. Toks buvo Konstantinas Jablonskis [p. 45].
ENThe scholar examines a question often posed by historians: Does the library of the Academy of Sciences truly hold the manuscript of the retrospective historical bibliography compiled by Konstantinas Jablonskis? For many years, scholars considered the bibliographic materials (RS f. 256-786, 754 pages) collected by an unknown scholar to be Jablonskis’s bibliography. These materials contained XVII-XX century historical literature in various languages and organized in alphabetical order. The researcher discusses the history of these documents’ appearance and reviews the format, languages, subjects, chronology, sources of data, and the description of the bibliography. She concludes that this document is not Jablonskis’s retrospective bibliography of Lithuanian history. It would seem that this material in the archives is a collection of various bibliographic materials that Konstantinas Jablonskis gathered for various tasks: for the retrospective bibliography, for the library of the Institute of the Lithuanian Language, and for the catalogue of books on Lithuanian history.