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AfricaBib is a collection of Africana social science titles. Coverage spans the early 19th century to the present.

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AGRICOLA serves as the catalog and index of the U.S. National Agricultural Library.  All aspects of agriculture and allied disciplines are covered. It is primarily a citation-only database with some full-text material.

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Contains records (citations only, no fulll text) from the USDA's National Agriculture Library dating back to 1970. 

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AGRIS is a global database providing access to bibliographic information on agricultural science and technology, including grey literature not available through normal publication and distribution channels.

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The Anthropological Index Online is a database of articles based on the journal holdings of the Anthropology Library at the British Museum. The index covers the subjects of socio-cultural and physical anthropology, archaeology, linguistics, and cultural ethnography, providing a broad geographical range of information in each topic.

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The Aquatic and Invasive Plant Information Retrieval System (APIRS) includes annotated citations to peer-reviewed and gray literature and reports, with aquatic, wetland and natural area invasive plants as the focus.

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The ARDA (Association of Religion Data Archives) provides free access to religion statistics, data and church membership reports from around the world, including Christian statistics and adherents data. The ARDA offers recent U.S. and international survey findings, local, national and global profiles of religion, and detailed demographic reports and maps of religious and protestant denominations in America.

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The SOA/NASA Astrophysics Data System (ADS) is a digital library portal for researchers in astronomy and physics operated by the Smithsonian Atrophysical Observatory (SAO). It maintains three databases which cover publications in astronomy and astrophysics, physics, and the arXiv e-prints.

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