THE EFFECT OF RIDGING ON EASE OF HARVEST, ROOT DISTRIBUTION, AND TOXIC CONSTITUENTS OF DERRIS ELLIPTICA Authors R.H. Hageman Chemist, Federal Experiment Station, U.S. Department of Agriculture, Mayaguez, Puerto Rico C. Pagan Chemist, Federal Experiment Station, U.S. Department of Agriculture, Mayaguez, Puerto Rico Downloads Requires Subscription PDF Issue Volume 27 Number 2 Section Research Papers