This is a reference manual of the heats of formation and conformation of polycyclic hydrocarbons. The book compiles information on the polycyclic hydrocarbons from C5 to C14, including the IUPAC, Chemical Abstracts and trivial names; the Chemical Abstracts registry numbers; and the structures and heats of formation calculated by force field molecular mechanics.The book is directed to research-level chemists who are interested in this group of compounds and to institutions and industrial companies who work with these compounds, i.e. basic chemical companies and petroleum companies.The author is a well-known chemist and former president of the American Chemical Society Board of Directors.