The Biodiversity Heritage Library (BHL) headquartered at the Smithsonian Library is the world's most comprehensive digital collection of the legacy literature of biodiversity. All materials in the BHL are free to access, download, reuse and repurpose under the principles of open access and open data. The BHL collection consists primarily of books and journals published prior to 1923. The subject content includes all levels of organismic organization, from genes to ecosystems, as well as other disciplines affecting the study of the biodiversity of life on Earth. (Updates ongoing)
This permalink is a direct, persistent URL to the database that will always work and won't break.
Mostly pre-1923 content