there are artbooks for MGS1 and MGS2 at least, don't know about the other games
Japanese artbooks with the captions and interviews also translated into english (not sure if it's a matter of the original japanese texts, but the english translation had me smirk a couple of times ;) )
if it helps, here are the ISBNs:
ISBN 4-7973-0950-4
ISBN 4-7753-0065-2
there are artbooks for MGS1 and MGS2 at least, don't know about the other games
Japanese artbooks with the captions and interviews also translated into english (not sure if it's a matter of the original japanese texts, but the english translation had me smirk a couple of times ;) )
if it helps, here are the ISBNs:
ISBN 4-7973-0950-4
ISBN 4-7753-0065-2