Dr. Van Dyke presents a good discussion of the role of perturbation methods to fluid mechanics. Topics include an overview of perturbation methods (matched asympotic expansions, successive approximations, strained coordinates, etc.) as well a broad range of applications ranging from low speed viscous (Stokes) flows to hypersonic flows. I found this book far more approachable than other perturbation texts (e.g., Kevorkian & Cole). And, like his renowned "Album of Fluid Motion," the price has been kept low. It should be on the shelf of any serious fluid dynamicist.