From number 33: Mankind constantly analyzes radio waves from outer space in the search for extraterrestrial intelligence. Since this analysis started, almost a

From number 33: Mankind constantly analyzes radio waves from outer space in the search for extraterrestrial intelligence. Since this analysis started, almost all of the signal sources have been identified. 37 signals, however, remain unexplained. I couldn't find a list of these signals, or a reference to the number 37. The wikipedia entry for 37signals says it's a reference to signals discovered by Paul Horowitz: http://en.wikipedia.org/wiki/Paul_Horowitz http://en.wikipedia.org/wiki/Paul_Horowitz, but none of the links have stuff about specific signals discovered. Anybody know where I could find a list and/or descriptions of these signals?