2010DIN 4020:2010-12 Geotechnical investigations for civil engineering purposes - Supplementary rules to DIN EN 1997-2 / Note: Applies in conjunction with DIN EN 1997-2 (2010-10), DIN EN 1997-2/NA (2010-12).
2010DIN 4020:2010 Geotechnical investigations for civil engineering purposes - Supplementary rules to DIN EN 1997-2
2003DIN 4020:2003 Geotechnical investigations for civil engineering purposes