Tabla de Contenidos: “…Private Library Research in Regional Contexts -- Mercury in the Republic of Letters: Private Libraries in Spanish Book Sales Catalogues (1660-1800) / Pedro Rueda Ramírez and Lluís Agustí -- Lists of Private Book Collections in the Polish-Lithuanian Commonwealth and Royal Prussia, 1680-1830 / Michał Bajer -- Surviving Records of Private Book Collections in the Kingdom of Hungary and the Transylvanian Principality between 1665 and 1830 / István Monok -- From Extensive Learned Libraries to Modest Book Collections: Research on Danish Private Book Collections of the Long Eighteenth Century / Jonas Thorup Thomsen -- The Cornerstone of Scholarship: Library Catalogues in Late Imperial China / Fan Wang -- Part 4. …”