Fonds consists mostly of cartographic materials relating to reconnaissance trips taken by R.C. Harris. The maps are both historic and those drawn up by Harris for his trips, incorporating old trails on current maps. While the inclusive dates of the map collection are from 1835 - 1981, the majority of these maps were created from 1880 -1930. They are organized according to a personal classification system maintained by R.C. Harris. The remainder of the fonds consists of surveys, plans, photos, correspondence, topographical notes, magazine and newspaper clippings, Harris research notes, books, reports, brochures, photocopies, and book reviews.