The 1951 "Map of Lands Administered by the N.Y. State College of Agriculture" shows the same 4 structures along Stevenson Road as the 1937 Compass System Rural Index.

The 2nd from the left is in Tract 64 in this map, labeled as the Helfer Purchase with use indicated as "Pl. Br." (for Plant Breeding).  The legend indicates that this 59-acre parcel was acquired in 1948. This corresponds in position to "4E Ithaca 12S" in the 1937 Compass System Map.

The 3rd from the left is in Tract 23, labeled "A. I. Reed" and "Pastures and F.P. Crops".  The legend to this map indicates that the 92-acre tract was acquired in 1938. This corresponds in position to "4E Ithaca 16S" in the 1937 Compass System Map.