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The terms "free", "subscription", and "free & subscription" will refer to the availability of the website as well as the journal articles used. Furthermore, some programs are only partly free (for example, accessing abstracts or a small number of items), whereas complete access is prohibited (login or institutional subscription required).
NASA Technical Reports Server (NTRS) - resource for students, educators, researchers, and the public for access to NASA's current and historical technical literature since it was first released in 1994; Free website Analyzer - is a free online service that collects information about domains and keywords for which they were optimized.
Google Scholar is a freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines. . Released in beta in November 2004, the Google Scholar index includes peer-reviewed online academic journals and books, conference papers, theses and dissertations, preprints, abstracts, technical reports, and other ...
Here are nine websites and tips to help you learn for free or cheap. 1. Learn Anything on YouTube ... English proficiency test fee waivers are available for low-income students. 5. Earn a Free ...
Encompasses articles on the topic of mathematics: Free Encyclopedia of Triangle Centers: English Information about ten thousands of triangle centers, including coordinates, operations, incidence, equations, etc. Free EqWorld: English, Russian Articles on mathematical equations: Free MathWorld: English Articles on a wide variety of mathematics ...
Khan Academy is an American non-profit [3] educational organization created in 2006 by Sal Khan. [1] Its goal is to create a set of online tools that help educate students. [4] ...
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Academia.edu is a commercial platform for sharing academic research that is uploaded and distributed by researchers from around the world. All academic articles are free to read by visitors, however uploading and downloading articles is restricted to registered users, with additional features accessible only as a paid subscription.