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In page Battle of Salla (1939):
"Southern Lapland is 80% covered by forests or swamps. The geography is dominated by forest-covered fells that surround large swamps and lakes. In December 1939 the lakes and swamps were not yet sufficiently frozen over to support motor vehicle movement but this became irrelevant as the winter progressed and the temperature dropped to -40°, which also made military operations more difficult.[1]
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