1. University of Pennsylvania, Oversize LJS 442 Title: Buch von den probierten Künsten Author: Franz Helm Place: Bavaria Date: [between 1585 and 1599?]
2. University of Pennsylvania, Oversize Ms. Codex 109 Title: Feuer buech Author: Franz Helm Place: Germany Date: 1584.
3. University of Pennsylvania, Oversize Ms. Codex 1797 Title: Schwebell zuem pulffer unnd feuuerwercken zue beraitten Author: Franz Helm Place: Bavaria Date: [circa 1598]