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WikiPedia: Polar low http://www.maritime-executive.com/article/record-h... http://meted.ucar.edu/norlat/snow/polarlows/3.2_sa... http://andvari.vedur.is/~halldor/HB/Met210old/Glob... http://nsidc.org/arcticmet/patterns/polar.low.html https://books.google.com/books?id=-tBa1DWYoDIC&pg=... https://www.wunderground.com/blog/JeffMasters/the-... https://archive.is/20121209012233/http://nsidc.org... https://web.archive.org/web/20041209235643/http://... https://web.archive.org/web/20050831020251/http://... https://web.archive.org/web/20100324184958/http://...