Found in 7 Collections and/or Records:
This collection (1934-1980, undated) contains Hartley's professional papers, as well as technical reports and consultation reports for the National Testing Service (NTS) and National Aeronautics and Space Administration (NASA). The collection also contains lecture notes and handouts for his various classes at Texas A&M University and correspondence and meeting materials regarding committees from Hartley's work with the ASA.
This sub-group (1938-1944, undated) includes county maps accompanied by count units giving their size measures. These maps and statistical data sheets make up the content of each envelope (unless otherwise noted). Of the three original sets, this is probably the only one still in existence.