Index Locupletissimus Librorum [...].: Vollständiges Bücher-Lexicon [...] : in alphabetischer Folge, mit einer vollständigen Uebersicht aller Autoren, der anonymen sowohl als der pseudonymen, und einer genauen Angabe der Kupfer und Karten, der Auflagen und Ausgaben, dr Forrmate, der Druckorte, der Jahrzahlen, der Verleger und der Preise. Die Erscheinungen von 1847 bis Ende 1852, sowie Nachträge und Berichtigungen früher erschienener Werke enthaltend. Theil 11-12

The Vollständiges Bücher-Lexicon was established as a monumental bibliographic project by Christian Gottlob Kayser, serving as the definitive index for the German book trade during the 19th century. Volumes 11 and 12, published in the mid-1850s, meticulously documented the German-language literary output between 1847 and 1852. This period was characterized by a rapid expansion of the printing industry and an increase in literacy across German-speaking states, making such comprehensive indices essential tools for librarians, booksellers, and scholars to navigate the deluge of new publications.

The design of these volumes prioritizes functional utility, adhering to strict alphabetical organization to accommodate the vast metadata required for each entry, including pseudonyms, printing formats, and map inclusions. Kayser’s meticulous methodology set a standard for cataloging that would influence later European bibliography. These volumes were intended to be permanent reference works for the educated public and professional archivists, and they remain valued today as primary source material for tracking the intellectual history of the mid-19th century.