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I have in the past, purchased quite a few photos from sites like.transportphotos.com/road and all they ask is that you put there name on the thread so has to point people towards there website plus they ask you not to resell any of the photos purchased, which is fair enough I think.I have always had a good responce from most people I have asked,they just want others to enjoy what sometimes can be nostalgic pictures.
JOHN