- Hopkins Engineering Co Mylar Film Data Log 1957 (8pg) – HL Scan
- Hopkins Engineering Co Hy-Therm Data Log 1957 (8pg) – HL Scan
- Hopkins Engineering Co Mylar Foil Data Log 1957 (8pg) – HL Scan
- Hopkins Engineering Co Met. Mylar Data Log 1957 (8pg) – HL Scan
- Hopkins Engineering Co Met. Paper Data Log 1957 (8pg) – HL Scan
- Hopkins Engineering Co Polystyrene Data Log 1957 (8pg) – HL Scan
