AMPHI-ATLANTIC ZONATION, NEMORAL TO ARCTIC 125 



Spence, D. H. N. (1960). Studies on the vegetation of Shetland. III. Scrub in Shetland and 



in South Uist, Outer Hebrides. J. Ecol. 48, 73-95. 

 TiKHOMiRov, B. A. (1960). Plantgeographical investigations of the tundra vegetation in the 



Soviet Union. Catiad. J. Bot. 38, 815-832. 

 TiKHOMiROV, B. A. (1961). The changes in biogeographical boundaries in the north of 



U.S.S.R. as related with chmatic fluctuations and activity of man. Bot. Tidsskr. 56, 



285-292. 

 Wilson, C. (ed.) (1954). North of 55\ Toronto. 



