BASE: Bielefeld Academic Search Engine one of the best and most comprehensive tools for locating open-access books, journals, dissertations, and other scholarly sources available worldwide.
Websites
Atomic Energy and Nuclear History Learning Curriculum
BMC Biophysics Open Access Journals
Digital Einstein Papers (Princeton University Press)
NOVA's Physics Blog: The Nature of Reality
Physics Physics is an online open access journal that focuses on highlighting a selection of papers from American Physical Society (APS) Physical Review journals.
PhysicsWorld.com (Institute of Physics)
Digital Libraries
MetaLib, a service of the Catalog of U.S. Government Publications (53 government databases, subject gateways, digital repositories and e-journals)
National Science Digital Library
OAIster More than 19 million digital resources from over 1,000 organizations developed by the University of Michigan.
Science Portal (U.S. Government)
WorldWideScience.org is a global science gateway comprised of national and international scientific databases and portals.
FermiLab. U.S. Dept. of Energy Particle physics technologies reveal the structure of proteins,