text: Questia's FREE Encyclopedia"Questia's FREE encyclopedia includes more than 52,000 articles from the Columbia Encyclopedia, Sixth Edition. Each article is enhanced with links to Questia's premium reference library of more than 67,000 full-text books and 1,500,000 journal, magazine, and newspaper articles."
  
  (Split into Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science,
  Split into Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere,
  Split into Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy)
  
  (Incorporating Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere,
  Incorporating Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy,
  Incorporating Physics and Chemistry of the Earth, Part C: Solar, Terrestrial & Planetary Science)
  
  ArXiv -
  arXiv is an e-print service in the fields of physics, mathematics, non-linear science, computer science, quantitative biology and statistics. The contents of arXiv conform to Cornell University academic standards. arXiv is owned, operated and funded by Cornell University, a private not-for-profit educational institution. arXiv is also partially funded by the National Science Foundation in collaboration with local support.
  
  Vox Charta - Vox Charta is a clone of astro-ph used for astronomy and astrophysics paper discussions. Users of this website have the ability to vote for papers they would like to talk about at the next discussion session.
  
  Web of conferences (EDP Sciences) - An international congress calendar in all the scientific fields. A complete conferences proceedings publishing service