Research materials include documents used by the collector, Dennis Kruska, in order to provide background on the subject of Japanese internment during World War II. Some materials describe first hand experiences of life in the relocation centers, others are printed web pages from websites such as the National Park Service (NPS.org) or owensvalleyhistory.com. This series also contains printed copies of photographs, not part of the collection, printed from eBay by Kruska.