This text is one of the most valuable references in field of fluid dynamics. I first made use of it for my research at Liverpool John Moores University during the early 1990s. I am still making use of it today as a key reference in my continuing independent study of the difficult physical phenomenon of turbulence. I recommend it to all scientists and engineers seeking a dependable reference text in their study of turbulence, a very important subject affecting many branches of science and engineering.