Neall, George M III2014-03-142014-03-141975-05-04etd-06022010-020155http://hdl.handle.net/10919/42838none availablex, 134 leavesBTDapplication/pdfIn Copyrightconservation of natural resourcescoal miningLD5655.V855 1975.N43A photoelastic study of roof truss-roof interactions in a multilayered mine modelThesishttp://scholar.lib.vt.edu/theses/available/etd-06022010-020155/