- Libro electrónicoDevelopment of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966Victor Fritz Lenzen
- Libro electrónicoDevelopment of Gravity Pendulums in the 19th CenturyRobert P. Multhauf
- Libro electrónicoThe Introduction of Self-Registering Meteorological InstrumentsRobert P. Multhauf
- Libro electrónicoDevelopment of Gravity Pendulums in the 19th CenturyVictor F. Lenzen
- Libro electrónicoThe Introduction of Self-Registering Meteorological InstrumentsRobert P. Multhauf
- Libro electrónicoMine Pumping in Agricola's Time and LaterRobert P. Multhauf