Serapeum Multi-Catalog Bibliographic Search allows WordPress administrators and editors to consult national and international library catalogues in real time via the SRU (Search/Retrieve via URL) protocol.

Features include:
* Search supported library catalogs using Title, Author/Creator, and Year filters.
* Import records directly into WordPress as Draft Posts using native 2-column Gutenberg block layouts.
* Export search results to CSV or BibTeX (.bib) formats for integration with reference managers (Zotero, Mendeley, EndNote).
* Clean, single-file lightweight architecture with zero external PHP dependencies.

External services

Supported Catalogs:
* BnF – Bibliothèque nationale de France (France)
base_url: https://catalogue.bnf.fr/api/SRU
Documentation: https://api.bnf.fr/fr/api-sru-catalogue-general
Conditions & Lienses: https://www.bnf.fr/fr/conditions-de-reutilisations-des-donnees-de-la-bnf

Hispana – Ministerio de Cultura y Deporte (Spain)
base_url: https://hispana.mcu.es/es/sru/sru.do
Documentation: https://hispana.mcu.es/en/estaticos/contenido.do?pagina=estaticos%2Fsru
Conditions: https://hispana.mcu.es/es/contenido/aviso-legal.do
DNB – Deutsche Nationalbibliothek (Germany)
base_url: https://services.dnb.de/sru/dnb
Documentation & licenses: https://www.dnb.de/EN/Professionell/Metadatendienste/metadatendienste_node.html