Fig. 3. Composite of four aerial photographs of the Carlinville, Illinois, area taken in October 1937 by the U.S. Department of Agriculture. The photos are filed in the University of Illinois Map Library as Macoupin County 1937 aerial photographs CK 4: 37, 39, 118, and 120. The individual letters on the photos are to help viewers quickly locate the same area. RN indicates the approximate location of Robertson’s neighborhood, a few blocks south of Blackburn College, where he taught. SR 4 and SR 108 are state highways. Locations A through E are common to all three photos, whereas F is common to 1937 and 1993, and G and H are common to 1968 and 1993. Click on the image below to view a high-resolution copy of the composite.