Finding Information in Electronic formats:
Electronic databases
Search engines
Useful websites
Electronic journals
Electronic books (ebooks)
Electronic theses

Electronic databases
often permit you to find information on a topic, more effectively than using a search engine like Google.  There are databases for almost every subject, and you can search them by keywords, by author, and many other options.  Many are accessible only upon payment of a subscription.  All provide online help to their use. 
The databases below are useful free sources of information for Agriculture, Forestry and Animal Science.  Most include some full text access, but none provide full access to everything listed:
Agricola (http://agricola.nal.usda.gov/) - a free database that lists the books and journals articles listed in the USDA Library’s catalogue.  Does NOT provide access to the material listed.
Agricultural Network Information Center (AgNIC) -  (http://www.agnic.org/)  - provides links to a number of free downloadable resources using a simple search engine, compiled by a partnership of agricultural institutions and organizations
CABAbstractsplus (http://www.cababstractsplus.org/Abstracts/Default.aspx) - free access to about 10% of the Commonwealth Agricultural Bureau Abstracts database.
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Search Engines
provide access to all types of information.  For guidance on using the internet for researching a topic use this link:  http://www.une.edu.au/library/eskillsplus/research/web.php
Google - (http://www.google.com) use the Advanced Search option for more precise searching and to save yourself having to know the correct syntax for constructing your search
Google Scholar (http://scholar.google.com) allows you to run a Web search which is (in the main) restricted to high-quality, scholarly literature. Items in Google Scholar's index include citations, full-text peer-reviewed articles, theses, books, preprints, abstracts, conference papers and scientific reports. Much of this material is difficult to access in other ways.  There is also an Advanced Scholar option.
Google Books - (http://books.google.com) many books linked in Google books provide limited preview to their contents, sometimes a chapter or larger section can be read on line.