Sigmar Polke's "Photographes 1969-1974"

I recently checked out this book on interlibrary loan. First of all I cannot believe Boston College doesn't keep it in their Special Collections because it is an amazing book full of loose images. Secondly, I am enamored with this photograph labeled "Untitled (Die "Nachtwache" Im Petis Palais, Paris"), 1971. It predates Thomas Struth and gives the impression of a photograph fifty years older due to the faded quality. I have always loved his use of alternative processes, hallucinogens and all.