In the summer of 1971, Michael Lesy and a friend found most of the snapshots in Snapshots 1971-77 in a dumpster behind a gigantic photo-processing plant in San Francisco. The photos were in the trash because the machines that printed them made them so fast -- duplicates, triplicates, quadruplicates -- that the people on the processing line couldn't stop them. Week after week, Lesy took home thousands of snapshots from the dumpster. He studied them...