TY  - BOOK
AU  - Multhauf,Robert P.
TI  - 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
PY  - 2011///
PB  - Project Gutenberg
N1  - Public domain in the USA; Electronic text
UR  - http://www.gutenberg.org/ebooks/35024
ER  -