History Workshop Online has recently posted an online exhibition of material from the History Workshop archives held at Bishopsgate Institute.

An introduction by Barbara Taylor is here:
http://www.historyworkshop.org.uk/the-history-of-history-workshop/
And an index and introduction by Luke Parks is here:
http://www.historyworkshop.org.uk/the-history-workshop-archives-an-introduction/
There is a page about each of the History Workshops, and the thirteen
pamphlets published by History Workshop between 1970 and 1974 have also
been digitized.
http://www.historyworkshop.org.uk/history-workshop-pamphlets/

http://www.historyworkshop.org.uk