On the trail of their father's killers, the Hardy Boys uncover a new piece of evidence: Fenton Hardy may be alive after all. Third in the Phoenix Operation series.

This two-part treatment explains basic theory and details, including oscillatory solutions, intervals of stability and instability, discriminants, and coexistence. Particular attention to stability problems and coexistence of periodic solutions. 1966 edition.

The first of five books in the groundbreaking new series The Human Equation Toolkit. Mime Wayne Constantineau and scholar Eric McLuhan explore the four possible positions of humans -- standing, lying down, sitting, and kneeling -- as the basis of all developments in culture, science, activity, and media. As they write, "Man is the microcosm of the universe. Media are the extensions of man. The Human Equation is the doorway into all three ... The Human Equation deals with the relation between humans and our media, technologies, languages, theories, and ideas."

In the corporate world, complacent companies run the risk of extinction. In this guide, James Belasco and Jerre Stead propose that management must identify and focus on long-term future goals to propel a business into the future.

Exceptionally clear exposition of an important mathematical discipline and its applications to sociology, economics, and psychology. Topics include calculus of finite differences, difference equations, matrix methods, and more. 1958 edition.

Frank and Joe travel to Kenya to investigate the disappearance of a U.S. Customs official and find themselves up against a poaching and smuggling operation.