New in shrink-wrap. Pittsburgh: Carnegie Museum of Natural History Publication No. 3, 1976. Six large tipped-in color plates by H. Jon Janosik, line drawings by Carol H. Rudy and b&w photos. The Ligonier Valley lies between Chestnut Ridge and Laurel Hill, the two westernmost ridges of the Allegheny Mountains, in Westmoreland County, southwestern Pennsylvania.