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The book is about 800 pages long.It is a classic reference to solve ODEs and thus contains almost all the tricks of the trade to solve an ODE, be it analytically or numerically.  The good thing about the book is that various methods are presented in the form of a “lesson-exercise-solution” format. Each lesson has good enough examples to give a clear idea of the technique used to solve the ODE. Another interesting feature of the book is that it is interlaced with chapters that describe various setups that generate ODEs. So, in one sense the reader can see everything in one place, i.e., the various kinds of settings that generate ODEs and the methods to solve the ODEs. I happened to go over this book mainly as I was stuck with an ODE that I did not want to solve it numerically. I went through a section of this book to figure out an analytical solution. I liked the style of the specific section so much that I ended up reading almost the entire book. Well, it is a reference and it needs to be used whenever you are in need. But I went through the book just to refresh all the ODE methods that were lying dormant in my memory.After going through this magnum opus on ODE, I am kind of exhausted and plan to stay away from differential equations at least for sometime.