M. Sdrolias, C. Gaina, and W. R. Roest 2008. Age, spreading rates and spreading symmetry of the world's ocean crust, Geochem. Geophys. Geosyst. 9, Q04006
978-0-7506-6348-9. https://archive.org/details/history-of-ancient-and-early-medeival-india-from-the-stone-age-to-the-12th-century-pdfdrive Spielvogel, Jackson
mathematician, historian of mathematics, historian and university teacher Date of birth/death 21 January 1860 29 July 1944 Location of birth/death Cortland