From the reviews:
"This is a collection of papers by one of the great mathematicians of our time. ... The depth and wide range covered by Lax’s research contributions illustrate his broad view of mathematical analysis as a whole. The editors ... have done an excellent job: they didn’t just collect some papers ‘at random’, but also explain, in detailed commentaries, the contents and importance of the included publications at the end of each section." (Jürgen Appell, Zentralblatt MATH, Vol. 1087, 2006)
"Since Peter Lax was chosen as the recipient of the 2005 Abel Prize, it’s hardly necessary to say that his work is important. Libraries should consider his Selected Papers an essential acquisition. This first volume collects papers on partial differential equations, difference equations approximating PDEs, hyperbolic systems of conservation laws, and integrable systems." (Fernando Q. Gouvêa, MathDL, October, 2005)