Fig. 4. Composite of six aerial photographs of the Carlinville, Illinois, area taken on 27 August and 21 September 1968 by the U.S. Department of Agriculture. The photos are filed in the University of Illinois Map Library as Macoupin County 1968 aerial photographs CK-1-JJ: 175, 177, and 178, as well as CK-3-JJ: 16, 17, and 20. 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.