Photograph of Norman Fischer sitting on a tractor and showing how a sub-surface tillage implement operates. The original photograph sleeve proclaims, "Norman Fischer, one of Louis Fischer's three sons who operate farm with him, shows how sub-surface tillage implement operates, cutting weed roots, loosening soil and mixing residue into surface. This type of equipment is coming into greater use as a means of controlling wind erosion in west Oklahoma blow areas. This tillage also helps control water erosion, which Norman says sometimes does more damage quicker than wind erosion. II HP 2-K."