Scope and Contents From the Collection: The material in this collection is largely devoted to Dr. Israelsen's professional life as a teacher, researcher, and private consultant in the dual fields of irrigation and drainage science. It includes his correspondence, class notes, research projects, and published and manuscript works. There are additional papers on irrigation and drainage science by other authors which were collected by Dr. Israelsen in the course of his own research. The Israelsen papers cover the years 1894...