“Oil: Crude and Petroleum Products Explained,” U.S. Energy Information Administration
“Oil Refining: A Closer Look,” American Association for the Advancement of Science
“Boiling points and structures of hydrocarbons,” Elmhurst University
Hydrocarbon Impacts Database - a subset of the University of Calgary's Arctic Institute of North America's Arctic Science and Technology Information System database
"Hydrocarbons" search from the National Science Digital Library