An excellent and very readable review of US/NASA space program"I read one more book bedore I read this one. This book gave me a "more historic view" of the US space program, than the one book I read and three other I browsed. The book is light in weight (paperback version) so it is easier on my hand and arms while reading( that means I can read longer time without getting tired. The writing and style are clear and concise. I enjoyed the prose. Some of the books I browsed have sentenses too long or too awkward. It has enough technical information as well as historical "tid-bits" to make it fun to read."