Retrieved 2017-11-06. ↑ "(IAG) International Association of Geodesy: Associations of IUGG". www.iugg.org. Retrieved 2017-11-06. ↑ "IUGG, the International Union of Geodesy and Geophysics | Union Geodesique et Geophysique Internationale". www.iugg.org. Retrieved 2017-11-06.