I found it on J.P. May's web site at http://math.uchicago.edu/~may/PAPERS/42.pdf  

<sub> Since this link might disappear, it is also archived at the <A HREF="https://web.archive.org/web/20120608135619/http://math.uchicago.edu/~may/PAPERS/42.pdf">Wayback Machine.</A></sub>