Vegetative Conditions in Nebraska, As Viewed by Satellite, 1987 Growing Season (LUM-29): Peters, A. J., Greegor, D. H., Jr. (1:2,500,000; 1988), size 31" x 24". Description: The six images clearly show the changes in photosynthetic activity of vegetation in Nebraska during the 1987 growing season. During the 1987 growing season, the state had near-normal rainfall. During the 1988 season, a drought hit southeastern Nebraska. Comparing the two posters (LUM-29 and LUM-30) shows this difference clearly.