This collection from a University of Kansas graduate and artist best known for his landscapes and portraits, contain letters that Dennis K. Helm received from many other Kansas artists, including Elizabeth Layton and his mentor, Robert Sudlow. Also in the collection are Helm's outgoing letters concerning other Kansas artists, manuscripts of his articles and essays regarding artists Robert Sudlow and Albert Bloch, and a posthumous sampler of Helm's writings, compiled in 1993 by Don Helm.

The collection consists of the artwork, photography, and teaching materials of Philip Henderson. Also included is correspondence and various materials of Philip's parents, Dwight and Edith, as well as journals of Philip and Edith Henderson.