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Plazi  is a Swiss non-governmental organization dedicated to the liberation of data imprisoned in flat, dead-end formats such as PDFs. In the process, the data therein is annotated and exported in various formats, following field-specific standards, facilitating free access and reutilization by several other service providers and end-users. This data mining and enhancement process allows for the rediscovery of the known biodiversity since the knowledge on known taxa is published into an ever-growing corpus of papers, chapters and books, inaccessible to the state-of-the-art service providers, such as Global Biodiversity Information Facility ( GBIF ). The data liberated by Plazi focuses on taxonomic treatments, which carry the unit of knowledge about a taxon concept in a given publication and can be considered the building block of taxonomic science. Although these extracted taxonomic treatments can be found in Plazi’s  TreatmentBank  and Biodiversity Literature Repository ( BLR ), hosted in the European Organization for Nuclear Research ( CERN ) digital repository  Zenodo , data included in treatments (e.g., material citations and treatment citations) can also be found in other applications as well, such as Plazi’s  Synospecies,   Zenodeo , and  GBIF . Plazi’s efforts result in more Findable, Accessible, Interoperable, and Reusable ( FAIR ) biodiversity literature, improving, enhancing and enabling access to data included therein as digital accessible data, otherwise almost unreachable.The Biodiversity Heritage Library ( BHL ), on the other hand, provides a pivotal service by digitizing heritage literature and current literature for which BHL negotiates permission, and provides free access to otherwise inaccessible sources.In 2021, BHL and Plazi signed a  Statement of Collaboration , aiming to combine the efforts of both institutions to contribute even further to FAIR-ifying biodiversity literature and data. In a collaborative demonstration project, we selected the earliest volumes and issues of the  Revue S  uisse de Zoologie  in order to conduct a pilot study that combines the efforts of both BHL and Plazi.The corpus is composed of eight volumes (tomes), 24 issues (numbers) and 98 papers, including a total of over 5000 pages and 200 images. To process this material, BHL assigned  CrossRef  Digital Object Identifiers (DOI) to these already digitally accessible publications. Plazi created a template to be used in GoldenGate-Imagine, indicating key parameters used for tailored data mining of these articles, and customized to the journal’s graphic layout characteristics at that time. Then, we proceeded with quality control steps to provide fit-for-use data for BLR and GBIF by ensuring that the data was correctly annotated and eliminating potential data transit blockages at Plazi’s built-in data gatekeeper. The data was then subsequently reused by GBIF. Finally, we present here the summary of the obtained results, highlighting the number of key publication attributes aforementioned (pages, images), but also including a drill-down into the different taxonomic groups, countries and collections of origin of the studied material, and more. All the data is available via the  Plazi   statistics , the Biodiversity Literature Repository  Website  and  community  at  Zenodo , the  Zenodeo APIs  and  GBI  F  where the data is being reused.

The BHL-Plazi Partnership: Getting data from the 1800s directly into 21st century, reused digital accessible knowledge