I really appreciated seeing proof sheets created from Marshall's rolls of film. For every pair of pages in this book, a black-and-white positive proof sheet is on the left-hand page, and the chosen (usually quite famous) print from that roll of film is on the right-hand page, along with a short paragraph describing the occasion of the shoot. The individual frames of the proof sheet are quite viewable: there are usually 35 frames printed on each sheet, and each sheet is printed in the book at about 8x10".
As a photographer, I envy other photographers' final products, and many times I like to see their rejected frames to catch a glimpse of their decision-making and their ad hoc/candid photos. The proof sheet serves as a documentary on how Marshall worked that day: how many repetitive frames he takes for well-prepared money shots, how he shoots horizontal portraits with the rule-of-thirds, and how many candids he takes.
The only thing missing is that the short paragraphs describing each shot do not delve into how Marshall selected the one shot from each roll. Looking through the proofs, it's clear that many good frames were left behind.
Finally, there is also a very nice picture evidently of Marshall's gear bag, containing several Leicas, rolls of film, and other stuff.