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https://www.federalregister.gov/documents/2014/12/09/2014-28808/endangered-and-threatened-…

Federal Register :: Endangered and Threatened Species; Designation of Critical Habitat for the Arctic Ringed Seal Skip to Content Home Sections Money Environment World Science & Technology Business & Industry Health & Public Welfare Browse Agencies Topics (CFR Indexing Terms) Dat…

https://www.federalregister.gov/documents/2012/12/28/2012-31066/endangered-and-threatened-…

Federal Register :: Endangered and Threatened Species; Threatened Status for the Arctic, Okhotsk, and Baltic Subspecies of the Ringed Seal and Endangered Status for the Ladoga Subspecies of the Ringed Seal Skip to Content Home Sections Money Environment World Science & Technology…

https://www.academia.edu/109001105/Reports_on_ice_caves_in_literature_from_the_Twelfth_to_…

C. Meyer, A. Pflitsch, J. Ringeis, and V. Maggi. Reports on ice caves in literature from the Twelfth to the middle of the Twentieth Century. Journal of Cave and Karst Studies, v. 79, no. 3, p. 141-145. DOI: 10.4311/2014IC0115 Reports on ice caves in literature from the twelfth to…