Reading:
Andy Grundberg, Crisis of the Real, 1990, chs: 'The New Photojournalism and the Old', & 'Magnum's Postwar Paradox' (pp. 184-195).
and/or:
Martha Rosler, 'In, Around, and Afterthoughts (on Documentary Photography)', in Liz Wells, The Photography Reader, 2003, pp.261-271.