Subgroup 1, Station Administrative Records, consists of fifteen series, the first four of which are on microfilm. Series I, Correspondence and Budget Reports, includes correspondence on a variety of administrative subjects, financial data from the 1960s, and information on regional research projects. Series II consists of Entomology Dept. course outlines form 1931. Series III includes newspaper clippings from the 1920s-1940s. Series IV consists of spray warnings from the 1930s and 1940s. Series V is the 1889 enabling legislation creating the Oregon Agricultural Experiment Station. Annual and biennial reports from 1889 to the 1960s constitute series VI. Series VII contains general correspondence from the 1960s-1980s.

Series VIII includes administrative and other policies and procedures. Reviews of departments and programs conducted in the 1970s and 1980s are found in series IX. Series X and XI are Councils and Committees Records and Special Events and Celebrations Records, respectively. The former includes minutes from the earliest Station Council meetings. Series XII, Legislative Information, contains information packets about the Experiment Station compiled for the legislative budgetary process. Surveys and Studies, series XIII, consists of readership surveys and studies of support for agricultural research in Oregon. Series XIV contains general informational reports about the Experiment Station. Series XV is a scrapbook of information and advertisements from the 1920s about the Rockingham Farm.

Subgroup 2, Branch Station Records, consists of eighteen series, the first fifteen of which pertain to individual branch stations. Records are on microfilm and in paper form, and pertain to general administration, land and buildings, equipment, history, special projects and events, and relationships with other organizations and governmental agencies. Records of research projects conducted at branch stations can be found in Subgroup three, Series V, Research Projects Records. Series XVI consists of general and historical information on the branch stations compiled by the director's office. Series XVII includes information on branch stations that were proposed but never established. Series XVIII is a bound volume of early annual and biennial reports from several branch stations. Most reports can be found in the series for the individual branch station.

Subgroup 3, Research Records, contains the bulk of the records for the record group, some of which date back to the station's establishment in 1889. Series I-III pertain to experiments conducted by the Station Chemist from 1889 to the mid-1930s. Series IV includes annual lists of the station's research projects. Series V contains the Station's research project files, dating back to the first decade for this century up through 1980. They are organized into several sub-series: by project number, by department or by branch station. Records for a particular project occasionally are found in more than one subseries, and may be found in both paper an microfilm forms. Series VI includes recent information on sources of research funding. Series VII contains memos of understanding and agreement between the station and another organization (governmental agency, university, etc.) regarding specific research. Most memos of understanding and agreement can be found with the corresponding project records in series V. Series VIII includes information on new crop varieties developed and released by Oregon State University since 1949. Series IX includes a 1935 land use map for Oregon and soils maps for selected counties from the 1910s and 1920s.