By Harold L. Wanless, Dept. of Geology, University of Illinois. Contains 92 aerial photographs for the three-dimensional study of cultural features, landforms, rock structure, vegetation, soil types, and conservation. Shows elevations, depressions and contours of natural terrain. 8-1/2" x 11". Spiral bound. 92 pages. Availability: Usually ships the same business day Aerial Stereograms 581$14.50 Need more information? Please feel free to contact us at 1-800-592-6940 - Ask for Extension 547 or Internet Sales.