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Now two copies have appeared in the past month. About two weeks ago, a copy of El Dorado Narrow Gauge sold on an eBay auction for about $110.
This copy appeared yesterday. It has an opening bid price of $9.99 The auction closes Monday, November 26, 2007 at 5 p.m.
It's difficult to predict how high the book will go. It wouldn't surprise me if it goes for $90 or higher.