1. Abebe T, Mazzarini F, Innocenti F, Manetti P (1998) Yerer-Tullu Wellel volcanotectonic lineament: a transtensional structure in central Ethiopia and the associated magmatic activity. J Afr Earth Sci 26(1):135–150
2. American Railway Engineering and Maintenance of Way Association (AREMA) (2009) Manual for railway engineering, vol. 1, Roadway and Ballast, USA, 1292 pp
3. Indraratna B, Khabbaz H, Salim W, Christie D (2006) Geotechnical properties of ballast and the role of geosynthetics in rail track stabilization. Univ Wollongong Res Online 3:91–101
4. Kidane T (2010) Final Report on Structural and Geological Mapping for the Wolkite Ambo Ground Water Potential Assessment Project. Water Works Design and Supervision Enterprise (unpublished), Addis Ababa Ethiopia
5. Raisanen M, Mertamo M, Stenlid L, Viitanen J (2006) Laboratory crushing of rock aggregates. Paper number 411, Geological Survey of Finland