I'm looking for any of this German standard on English:

Refuelling stations:
VdTUV Merkblatt 510 (for public fuelling stations)
DVGW G 651 (for utility fuelling stations) - urgently
DVGW G 624 (Natural gas as vehicle fuel - Sampling and analysis)

Natural Gas Vehicles:
VdTUV Merkblatt 757 Requirements for vehicular CNG-equipment
DIN 51624 (2007-01) (Vehicle fuels - natural gas - requirements and test methods).


Can anybody provide these or tell me where i can find them please?

Thx in advance.