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- Biodiversity Heritage Library
The Biodiversity Heritage Library (BHL) is the world’s largest open access digital library for biodiversity literature and archives. BHL is revolutionizing global research by providing free, worldwide access to knowledge about life on Earth.
- Botanicus Digital Library
Botanicus is a freely accessible portal to historic botanical literature from the Missouri Botanical Garden Library. Botanicus is made possible through support from the Institute of Museum and Library Services, W.M. Keck Foundation, and the Andrew W. Mellon Foundation.
- Core Historical Literature of Agriculture
A core electronic collection of agricultural texts published between the early nineteenth century and the middle to late twentieth century. Full-text materials cover agricultural economics, agricultural engineering, animal science, crops and their protection, food science,forestry, human nutrition, rural sociology, and soil science.
- IUCN Red List of Threatened Species
Established in 1964, the International Union for Conservation of Nature's Red List of Threatened Species has evolved to become the world's most comprehensive information source on the global extinction risk status of animal, fungus and plant species.