Accession 2006:054 consists of images taken by Henderson of Triad Club meetings, parties, and picnics. There are also a few shots of a Blue Key Honorary Society meeting held at Robert Henderson's house.
Accession 2006:067 is primarily made up of images documenting Triad Club meetings. This transfer also includes shots of the interior of Henderson's house and a local coin collectors' show. A three-ring binder of sleeved prints used by Henderson to interest fellow club members in ordering copies of his photographs was also found in this transfer.
Accession 2006:073 consists of images documenting class reunion gatherings, visiting faculty, agricultural research, campus views, Triad Club meetings, building dedications, Oregon State Fair activities, exhibits at the Oregon Museum of Science and Industry (OMSI), commencement ceremonies, OSU band performances and OSU football games. Photographs taken by Henderson of his Russian Dandelion doctoral research as well as his involvement with Kasetsart University in Thailand are also found in this transfer.
Accession 2007:086 is made up of images documenting Henderson's retirement party, strawberry research, the Columbia Gorge and other Oregon scenic regions, meetings of the Portland Executives Association, and students from Thailand visiting OSU. Also included in this accession are two sets of inventories listing the numbered slides. The original inventory by Henderson is documented in three 3-ring binder notebooks which describe the subject matter of the image, date, the photographer (if not Henderson), and the number assigned to the photograph. The other inventory is a consolidation of the information from the three notebooks into one list, as compiled by Crop and Soil Science Department Professor Arnold Appleby. Lists of numbered images compiled by Henderson in preparation for particular presentations and correspondence requesting reproductions of some of Henderson's photographs were also found in this transfer.
Accession 2007:097 consists of photographs that document plant research, Alpha Gamma Delta Sorority events, Triad Club meetings, a local coin collector club meeting, a music rehearsal at LaSells Stewart Center, the 1968 graduation commencement, and OSU Marching Band formations at a football game. Also included in this transfer is a photo album of prints depicting aerial and ground shots of campus, agricultural research, the landscape around the greater Corvallis region, Oregon coastal scenes, and students engaged in study. Many of these images were numbered by Henderson and inventoried in a master index maintained by him. Copies of this index can be found in an earlier accession of images for P 098.