Google? Or are you after actual copies?
Flight's website with many photographs? Flight does have a reprint service (or did, anyway).
Air Britain has recently published a book on Miles Aircraft by Peter Amos, so you could ask them for his contact details.
There is a Aircraft Museum devoted largely to Miles _
http://www.aeroflight.co.uk/mus/uk/l...kshireavtn.htm
They would be grateful to help.