German standard methods for the examination of water, waste water and sludge; sludge and sediments (group S); determination of leachability by water (S 4)— 10 стр.
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Land drainage and infiltration management works— 12 стр.
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Land drainage and infiltration management works— 12 стр.