Collection Scope From the Collection: SERIES I: Personal (1919-1984) documents Dr. Hatt’s life and work at Cranbrook Institute of Science and elsewhere. Within the correspondence folder are letters describing Dr. and Mrs. Hatt’s travel in Pakistan and Africa. Two diaries chronicle Dr. Hatt’s activities during his retirement years. SERIES II: Travel Journals (1920-1984) consists of journals documenting several decades of world travel and field work. Starting in 1919 with his summer field work in Wyoming and Colorado,...