<strong>Byrne, J.R., Chassie, R.G., Keeley, J.W., Bruce, D.A., Nicholson, P., Walkinshaw, J.L., DiMillio, A., Jackura, K.A., Chapman, R., and Ludwig, C. (1993)</strong><em>“FHWA Tour for Geotechnology - Soil Nailing” </em>Federal Highway Administration, Washington D.C., FHWA-PL-93-020.