I'll start with a book that has been keeping me company over Xmas - not quite so easy to find (my temporary copy thanks to the Banff Centre for the Arts library):
Berlin in the Time of the Wall by John Gossage.
"The Muse of photography is not one of Memory's daughters, but Memory herself." John Berger
"The photograph isn't what was photographed. It's something else. It's a new fact." Gary Winogrand"The basic material of photographs is not intrinsically beautiful. It’s not like ivory or tapestry or bronze or oil on canvas. You’re not supposed to look at the thing, you’re supposed to look through it. It’s a window.” John Szarkowski
"Facts do not convey truth. That's a mistake. Facts create norms, but truth creates illumination." Werner Herzog