Help please

[chataigne]

Since a months i'm looking for german trench maps of Ypres. But i definitly can't found it!
I'm studiant and i had to make a folder to compare an english trench maps and a german trench maps. When i search i only found english maps…
Can someone show me where i CAN found it please?
Thanks

[Gardiendelombre]

I think it's not with the maps that you Will found the différences.

You will see the différences with à cut view of the trench ,or with aerials pictures .