Oregon Agricultural Experiment Station Annual Report of Hop Investigations, written by Chester E. Horner, Agent (Plant Pathologist, USDA); Sam T. Likens, Agent (Chemist, USDA); Charles E. Zimmermann (Research Agronomist, USDA); Alfred Haunold (Research Plant Geneticist, USDA); G. B. Nickerson (Hops Chemist, OSU); J. F. Anderson (Assistant in Plant Pathology, OSU).
Published by the U. S. Department of Agriculture, Agricultural Research Service Western Region, Corvallis, Oregon in cooperation with the U. S. Brewers Association and the Agricultural Experiment Stations of California, Idaho, Oregon and Washington.