Wayne,
Good stuff! Thanks for posting, as I just drove by the site the other day. I should have stopped.
The photo does show planting on the east side, with some small trees added between the natural trees and the fw on one of the holes in the NE part of this photo. Look at the apparent par 5 just NW of the circular grove of trees on the right. I also spy the few open areas filled in heavily with trees, as if the open area is completely undesireable.
On the west side, it shows planting too close to the fw - not recognizing the full canopy of the mature tree, as is typical, and a good example of why so many courses are now over treed.
Lastly, note how the wooded east side apparently has greener fairways than the open west. These must have irrigation, but I suspect that the system couldn't deliver all the water necessary in July 1939, and so the west side, exposed to prairie winds, is a bit drier.