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covers the vast territory of United States federal science, including more than 60 databases and 2,200-plus websites.The many allied agencies whose research is reflected include NASA, the US Department of Agriculture, and the US Environmental Protection Agency.Begun in 1991 as a physics repository, Ar Xiv has expanded to embrace mathematics, astronomy, statistics, economics, and other disciplines.
) allows users to search and retrieve the article contents of nearly 10,000 OA journals in science, technology, medicine, social sciences, and humanities.
All journals must adhere to quality-control standards, including peer review.
Cite Seerx is devoted primarily to information and computer science.
The database includes a feature called Autonomous Citation Indexing, designed to extract citations and create a citation index for literature searching and evaluation.
The indexing also captures citation data, permitting users to follow the thread of an idea or development over time, as well as to track a wide range of research-performance metrics.
The Web of Science also features , a free browser plugin that offers one-click access to the best available legal and legitimate full-text versions of papers.
An early form of OA literature involved authors, as noted above, making electronic, preprint versions of their papers freely available. You can find archives devoted to a single main specialty area, as well as general repositories connected with universities and other institutions.
(conveniently pronounced “archive,” and one of the earliest examples of a preprint repository).
Fortunately, most institutions have access to thousands of journals, so your first step should be to be to check with library staff and find out what is available via your institutional subscriptions.
For those who may be unfamiliar with other means of access, this blog post – the first in a series devoted to helping you “research smarter” – will provide a sampling of established data sources for scientific research.