Prof Ken Friedman has just released an electronic version of the Fluxus Reader. Fluxus was a cutting edge 'international network of artists, composers and designers' in the 1960s (Wikipedia). Ken was a member of Fluxus.
The hard copy Fluxus reader went out of print many years ago and copies sell for hundreds of dollars.
Owning the copyright to the Fluxus Reader, Ken has generously made an electronic copy available free through the University of Swinburne at http://hdl.handle.net/1959.3/42234