The fourth series includes Paul Lavietes's files on his mentor John Punnett Peters, and is arranged by type of material. In addition to a biography of Peters by Lavietes, a bibliography of Peters's publications, and memorial tributes to him following his death, there is correspondence with Lavietes regarding the John Punnett Peters Memorial Lectureship from 1956 to 1975. Additional information of the life and career of Peters can be found in the John Punnett Peters Papers (Manuscript Group 897).