Excerpts: Hop (Humulus lupulus) is an economically important crop in the Pacific Northwest of the United States and in many areas of Europe and Asia. The plant is dioecious. The strobiles (cones) from the female plant are used by the brewing industry to enhance the flavor of beer. Hop is a unique plant because of its daylength requirements and specific cultural practices; however, its agronomic requirements, management practices, and pest problems are often similar to those affecting other crops. Scientific investigations have been conducted on hops since the late 1800's, with work being done in many countries. The author does not suggest that these publications are the only ones available, but does feel that the following lists are comprehensive and cover all aspects of work done in the English language in the last 80 years and in foreign languages in the last 50 years. Many of the foreign language citations are translated because of their universal importance; some have English summaries. Many, however, are available only in their original form. The citations are listed in alphabetical order by author. The subject indexes list those citations, by number, that refer to a particular area of investigation. All foreign language publications cited are listed in a separate index. "Serial Sources for the BIOSIS Data Base," 1979 edition, was used as a resource for publication titles.