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- ASFA: Aquatic Sciences and Fisheries Abstracts provides abstracts in the areas of aquatic science, aquatic organisms, fisheries and oceanography.
- ArXiv arXiv provides full text access to preprints for physics, mathematics, nonlinear sciences, computer science and quantitative biology.
- bioRxiv: A free online archive and distribution service for unpublished preprints in the life sciences, operated by Cold Spring Harbor Laboratory.
- BioOne Abstracts and Indexes covers biological, ecological and environmental sciences.
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