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Thanks, you got me interested. There's a free PDF of "The Little Book of Semaphores" by Allen Downey (and a video) here: http://greenteapress.com/semaphores/ h

by jmah 16y ago

Thanks, you got me interested. There's a free PDF of "The Little Book of Semaphores" by Allen Downey (and a video) here: http://greenteapress.com/semaphores/ http://greenteapress.com/semaphores/