German POWS's WW1, in labour camps.

Hi,

would any one know where I could find information on German POW's in
WW1, who were either forced or employed in labour camps. I have a series
of photos of them and military guards, camps etc.

They appera to either be excavating a railway cutting or a gravel
quary.. As it is onthe surface and the rocks are too light to be coal.

Regards

Sandy Barrie

apbarrie@bigpond.net.au