Institution (页面存档备份,存于互联网档案馆) Scott Polar Research Institute, University of Cambridge (页面存档备份,存于互联网档案馆) WWF:The Polar Regions (页面存档备份,存于互联网档案馆) *World Environment
provide a desirable orientation for arriving at a geostationary orbit. For polar orbits and Molniya orbits this does not apply. In principle, advantages
Council and commitment to the rights of its indigenous Ainu people. The Polar Journal. 2016-01-02, 6 (1): 169–187. ISSN 2154-896X. doi:10.1080/2154896X