PBS
Pbs: Who Made America?: Innovators: Edwin Drake
Dogged persistence led this man to drill -- and drill -- and drill, seeking oil deposits. His success launched an Oil Rush and brought the world a new energy source.
Wikimedia
Wikipedia: Shale
Originating as clay or mud, shale is a sedimentary rock formed by deposits of small particles by slow moving water. Wikipedia includes color images and discusses composition and deposition.
Geographic
Vietnam Geography
Contains all basic information on Vietnam geography with hyperlinks to more information on the Vietnam economy, politics, and military.