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@RobertMills an interesting (but nerdy) book on this sort of thing is books.google.co.uk/books?id=J9yzQcu5MXcC&pg=PA147&lpg=PA147&dq=airport+signage+colour+combination+conspicuity+values+signage&source=bl&ots=7vTf6Gd-XV&sig=p0PTk-zFYvWyVgLhY47uuo1Gnmc&hl=en&sa=X&ei=KLULUeuvIouBhQeT_oDABg&ved=0CGMQ6AEwBQ#v=onepage&q=airport%20signage%20colour%20combination%20conspicuity%20values%20signage&f=false I have a print copy knocking about.On twitter.com
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