Encyclopedias 

Wikipedia is a multilingual, web-based, free content encyclopedia project. Wikipedia is written collaboratively by volunteers from all around the world. With rare exceptions, its articles can be edited by anyone with access to the Internet, simply by clicking the edit this page link. - [Details]

Free resource offers more than 50000 concise articles from the Columbia Encyclopedia. - [Details]

The first web-source which provides information on all you have ever wanted to know about cigarettes, tobacco and cigarette manufacturers. - [Details]