T70 books

I have John Starkey's book "Lola T70 the racing history & individual Chassis record" I see he has another book with a slightly different name. Is there much difference between them to justify the $75 expenditure. It looks like there might be more color photos, but I'm more interested in the development & actual construction of the car it self. Than the histories of the cars built & raced.

despite the Lola T70 Mk3Bs history and abilities, there are no really detailed reference books about them, and it is basically the Starkey books or nothing.