For the layperson and the paleontologist, this is the definitive reference work on dinosaurian genera. Section I provides a thorough history of fieldwork, laboratory studies and paleontological research, and outlines several of the scientific theories of dinosaur extinction. Section II provides dinosaurian systematics toward the end of organizing the various taxa into a convenient and workable order. Section III is an alphabetically arranged compilation of dinosaurian genera. Section IV details the doubtful genera that have appeared in the paleontological literature. Section V lists "excluded genera," or taxa that had been previously regarded as dinosaurian. This heavily illustrated volume contains many depictions of life models constructed by experts in vertebrate paleontology restoration and based on the original fossil material. Supplemental volumes do not repeat information from earlier volumes, but build upon them: ISBN 978-0-7864-7222-2 Originial Encyclopedia ISBN 978-0-7864-0591-6 Supplement 1 ISBN 978-0-7864-1166-5 Supplement 2 ISBN 978-0-7864-1518-2 Supplement 3 ISBN 978-0-7864-2295-1 Supplement 4 ISBN 978-0-7864-3241-7 Supplement 5 ISBN 978-0-7864-4187-7 Supplement 6 ISBN 978-1-4766-6548-1 Supplement 7.