Source
Tanzania National Roads Agency _June, 2006
Tanzania National Roads Agency _June, 2007
Tanzania National Roads Agency _June, 2008
Tanzania National Roads Agency _June, 2009
Ministry of Works_Basic Statistics and Information in Construction Industry Sector_June, 2010
Ministry of Works_Basic Statistics and Information in Construction Industry Sector_June, 2011
Ministry of Works_Basic Statistics and Information in Construction Industry Sector_June, 2012
Ministry of Works_Basic Statistics and Information in Construction Industry Sector_June, 2013
Ministry of Works_Basic Statistics and Information in Construction Industry Sector_June, 2014