File Progress reports Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Ground Observer Corps, 1949-1952
File Observation Posts In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Ground Observer Corps, 1949-1952
File Lists Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Ground Observer Corps, 1949-1952 » Observation Posts
File Grand Rapids Filter Center Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Ground Observer Corps, 1949-1952
File Report-Notes on Ground Observer Corps and Civil Air Raid Warning Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Ground Observer Corps, 1949-1952
File Correspondence and reports Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Air Raid Warning System, 1950-1952
File Revision of Air Raid Warning Signals Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Air Raid Warning System, 1950-1952
File Air Raid Shelters Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Special Aspects of Civil Defense, 1947-1952
File Auxiliary police training course Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Special Aspects of Civil Defense, 1947-1952
File Civil Air Patrol Box 11 In: Donald S. Leonard Papers, 1925-1966 » Civil Defense » Post-World War II, 1947-1952 » Michigan Civil Defense » Special Aspects of Civil Defense, 1947-1952