1. Laughlin Papers. TSU: “A Few Points to Observe in Writing up Notes”. n.d.. In “Eugenics Field Worker-Material Used in Classes-1921” Folder, Box C-2-4:9, Harry H. Laughlin Papers, Pickler Memorial Library Special Collections, Truman State University (TSU), Kirksville, Missouri, USA.
2. “Brief Instructions on How to Make a Eugenical Study of a Family”. 1915. In “Eugenics in National Reconstruction; Eugenics Study Instructors” Folder, Box D-2-5, Laughlin Papers, TSU.
3. “Eugenics” typescript. n.d. In “Eugenics Office Established” Folder, Box C-2-3:6, Laughlin Papers, TSU.
4. “Family-Tree Folder”. n.d. “Forms used by Eugenic Record Office” Folder, Box C-4-3:3, Laughlin Papers, TSU.
5. Ferris, M.R. 1929. Ferris MR. to Harry H. Laughlin. 8 November. In “Institute of American Genealogy Magazine” Folder, Box D-4-2:9, Laughlin Papers, TSU.