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CODA is Caltech's institutional repository and includes electronic theses, technical reports, books, conference papers, and oral histories from the Caltech archives. 

E-LIS is an open access archive for scientific or technical documents, published or unpublished, on Librarianship, Information Science and Technology, and related areas. It provides several additional services such as: email alerts and RSS feeds and it employs the freely available GNU Eprints (v 2.3.3.) software.

PubMed Central is a free digital archive of journal literature on the biomedical and life sciences at the U.S. National Institutes of Health (NIH), developed and managed by NIH's National Centre for Biotechnology Information (NCBI) in the National Library of Medicine (NLM).

Developed at the University of Southampton, e-Prints Soton is the University's Research Repository and it contains a growing collection of literature from the University.

The Knowledge Bank is a repository containing collections of presentations, publications and reports from various institutions, developed by the Ohio State University.

ERA is a digital repository of research produced at The University of Edinburgh. It is a selection of the University's research material including full-text digital Theses and Dissertations, book chapters, working papers, technical reports, journal pre-prints and peer-reviewed journal reprints.

Developed by the Cornell University Library, arXiv is a highly-automated electronic archive and distribution server for research articles. It covers the areas of Physics, Mathematics, Computer Science, Nonlinear Sciences, Quantitative Biology and Statistics.