Tunnel Engineering. A Museum Treatment, by Robert M. Vogel 39785 [Link: http://www.gutenberg.org/3/9/7/8/39785 ] [Files: 39785.txt; 39785-8.txt; 39785-h.htm] Thanks to Chris Curnow, Tom Cosmas, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net David