2019DIN 18305:2019-09 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Groundwater lowering
2016DIN 18305:2016 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Groundwater lowering
2015DIN 18305:2015 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Groundwater lowering
2012DIN 18305:2012 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Groundwater lowering