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.
Hop Pests and Their Control: A Report of the Control of the Hop Red Spider and Other Closely Related Problems During the Season of 1940 was written by H. E. Morrison (Assistant in Entomology) and J. D. Vertrees (Research Fellow for the Dow Chemical Company).
Oregon Agricultural Experiment Station Annual Report of Hop Investigations, written by Stanley N. Brooks, Agent (Research Agronomist, USDA); Chester E. Horner, Agent (Plant Pathologist, USDA); Sam T. Likens, Agent (Chemist, USDA); Charles E. Zimmermann (Research Agronomist, USDA).
Oregon Agricultural Experiment Station Annual Report of Hop Investigations, written by Stanley N. Brooks, Agent (Research Agronomist, USDA); Chester E. Horner, Agent (Plant Pathologist, USDA); Sam T. Likens, Agent (Chemist, USDA); Charles E. Zimmermann (Research Agronomist, USDA).
Oregon Agricultural Experiment Station Annual Report of Hop Investigations, written by Stanley N. Brooks, Agent (Agronomist); Chester E. Horner, Agent (Plant Pathologist); Sam T. Likens, Agent (Chemist).
Oregon Agricultural Experiment Station Annual Report of Hop Investigations, written by Stanley N. Brooks, Agent (Research Agronomist, USDA); Chester E. Horner, Agent (Plant Pathologist, USDA); Sam T. Likens, Agent (Chemist, USDA); Yesh P. Puri, Jr. (Agronomist, OAES); Charles E. Zimmermann (Research Agronomist, USDA).
