Scientific Search Engines
  Web Link
  Link   Agecon Search
Searh Engine for Research in Agricultural and Applied Economics. Most papers are downloadable.
  Link   Organic Agriculture Info
This website has been developed by the Organic Agriculture Consortium (OAC)/Scientific Congress on Organic Agricultural Research (SCOAR) and funded by a grant from the Initiative for Future Agriculture and Food Systems (IFAFS) through the USDA Cooper
  Link   Scirus
Powerful feature: The keyword-based search refinement.
  Link   Google Scholars
The biggest search engine has a scientific branch.
(c) 2007 IMRD Student Association