Based on copies that have been preserved in the National and University Library, archival documents, early library inventories and catalogues, and accession logs, this article examines the presence of works by prominent French, English, and American philosophers and political philosophers in the Ljubljana lyceum library’s collection in the last decades of the eighteenth century and the first half of the nineteenth century. It also presents sources that testify to the influence of imperial censorship policies and legislation on the acquisition, recording, and lending of banned literature in the library until 1848, and provides information on individuals and institutions that kept works by banned authors in their personal collections before t...