The Institute of the Polish Language (Polish Academy of Sciences) holds a collection of lexical resources developed over decades, covering Polish and Latin used in Poland from the Middle Ages to the 21st century. These include monumental dictionaries — among them the Dictionary of Polish Dialects (Karaś et al. 1979–), the Dictionary of Medieval Latin in Poland, the Dictionary of Medieval Polish Personal Names, and the Dictionary of Polish Place Names — as well as card collections totaling approximately 6.5 million slips. This variety presents major challenges to unified storage and retrieval: the resources differ in scope, internal structure, editorial conventions, and metalanguage. In this paper, we present the workflow, data model, and current state of PoliLex, a project aimed at providing integrated access to these resources through harmonized modelling and semantic data publication. The text of most dictionaries was obtained from scans via OCR and post-correction, then progressively structured into TEI-conformant XML. The resulting files serve as the basis for data extraction and mapping to RDF via Ontology-Based Data Access mappings. The data model is built on a project ontology (PoliLex, v. 0.1) extending OntoLex-Lemon (McCrae et al. 2017) and its lexicography module (Khan et al. 2022), with a central distinction between the dictionary as a textual artifact and the language system it describes. The data are accessible through a full-text interface (TEI Publisher) and a SPARQL endpoint exposing lexical data as Linked Open Data, enabling cross-resource retrieval at the level of forms, definitions, and attestations.