Patrick, colored responses not withstanding, perhaps you assume everyone here knows what course you are referring to? But since some of us don't, how do you expect anything more than a wid-ass guess to your querries? There are some ok resolution aerials from the time period you speak but only in some more populated or military areas. Black and white.
It seems you have more information than you are letting out ie. built in 27 but changed in 29. If this is the case, I find it interesting that you would want to restore something that evidently did not work. Why else would they go through the time and money to change a something they just spent time and money building? Not everything works out as you hope but you don't find this out until people start playing it and you get to see how it reacts to play. Just because an ODA built something, that was changed almost immediately after opening, doesn't make it a candidate for restoration (if that is you main reason for this exercise). Now if it to do an autopsy on it to see if one can identify the reason for the quick change, that's another story.