Good photos,
I have seen a very nice collection of B/W photo's of Garden City but never of what I believe are taken behind # 18 green, as a couple of these pictures depict.
A few years back the super and I went around the course marking mowing lines and doing some digging in the bunkers to check depth. What we found was amazing, over time the depths of the bunkers have risen and you could tell by the different colors of sand added every so often with a sprinkling of silt in some locations.
The other item of interest for me was the cross bunker on 17, it looks way more pronounced in 1936 then what it appears today.
Photo's and angles do distort the heights of mounds but the rolls in the greens are very noticeable.