These two books are the story of Eds climbing these two mountains, which was covered in his No Shortcuts to the Top book, but here he goes into more detail. These are also histories of climbing on these two mountains, which is rather involved since they are extremely difficult to climb mountains. The early history of attempts to climb are interesting because to get to the base of these mountains originally involved weeks of hiking and employing a lot of porters to carry gear. As opposed to presently people just flying into the base of the mountains.