DIN 18311:2019-09 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Dredging work
2019DIN 18311:2019-09 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Dredging work
2016DIN 18311:2016 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Dredging work
2015DIN 18311:2015 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Dredging work
2012DIN 18311:2012 German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Dredging work