Subseries consists of the accumulation of research materials compiled by Doug Cox in support of his author and historian function, and presumed compiled predominantly during the 1980s and 1990s. This series is defined by its collection and/or photocopying from existing published sources and/or other resources, for which the originals reside both within and without the Cox Collection.
Subseries is composed predominantly of original and photocopied tear sheets from various periodical publications (with emphasis on the annual reports of the Okanagan Historical Society, which have been digitized in full up to 2015), monograph publications, photocopied photographs with identifying annotations, photocopies of correspondence, some original correspondence, and notes.

Landscapes showing developing infrastructure in the interior of British Columbia in the later 19th and early 20th century, with especially robust coverage of the construction of railroads and bridges, as well as some mining operations. Features group portraits of work crews.

Subseries consists of 265 photographs taken by Ed Aldredge of notable people, structures, landmarks, and events in Penticton, BC. The subseries consists secondarily of a collection of his published columns in the Penticton Herald and Okanagan Sunday as clippings, mounted in two large scrapbooks.