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How monolithic concrete linings in ditches for pond draining prevent ditch erosion requiring Reminimum maintenance. Photographs, drawings and diagrams. (CDC-5-034; 107 frames, color, synchronized disc, 15 minutes) 43. Personal Traits Analysis -ex- U.S. Department of the Army, 1946. (Examining Personnel for Civilian Employ- 41 ment Series No. 2) Sources of information for job analysis and steps in work. 43. 41 -ex-