The Last Album: Eyes from the Ashes of Auschwitz-Birkenau by Ann Weiss.
I spotted this book in the public library the other night, sat there and began to read its commentaries and look at the countless photos within its pages.
This book is a "matzevah"/monument/headstone to all those people in the photos who did not survive Auschwitz-Birkenau, other death camps and the horrible plight of World War 2.
The author spent several years, dealing with red tape of Polish bureaucracy, in order to salvage those photos and compile this living memorial to the faces.
A beautiful book. Seek it out.