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Fritz Lenzen, Victor Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966
 Fritz Lenzen, Victor Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966
Baur, Erwin Grundriss der menschlichen Erblichkeitslehre und Rassenhygiene von Erwin Bauer, Eugen Fischer [und] Fritz Lenz: 02
 Baur, Erwin Grundriss der menschlichen Erblichkeitslehre und Rassenhygiene von Erwin Bauer, Eugen Fischer [und] Fritz Lenz: 02
Fritz Lenzen, Victor