James Hinton. The Mass Observers: A History, 1937-1949. Oxford: Oxford University Press, 2013. This is not yet another book of extracts from Mass-Observation diaries (not that there's anything wrong with that) but a history of the organisation itself. Even within the chronological span covered, the focus is on the first five years (i.e. before Tom Harrisson was conscripted and so unable to exercise close control), but then that's when M-O was most active and influential. I only wish it could have been published, say, a year ago...
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