Legal restrictions have been suggested as a means to control or prevent introductions, but in the northern islands, little enforcement is likely. There is a phrase bearing on this, said to have governed human behavior in the early years of Caucasoid occupation of the Aleutian Islands, "Heaven is too high and the Czar too far away."
References
Bailey, A. M., C. D. Brower, and L. B. Bishop. 1933. Birds of the region of Point Barrow, Alaska. Prog. Act. Chic. Acad. Sci. 4(2):14-40.
Bancroft, H. H. 1886. History of Alaska, 1730-1885. San Francisco.
Berkh, V. 1823. The chronological history of the discovery of the Aleutian Islands or the exploits of the Russian merchants. N. Grech., St. Petersburg.
Campbell, R. W. 1968. Alexandrian rat predation on ancient murrelet eggs. Murrelet 49:38.
Carlquist, S. 1965. Island life: a natural history of the islands of the world. Natural History Press, New York.
Clark, A. H. 1910. The birds collected and observed during the cruises of the United States Fisheries Steamer "Albatross" in the North Pacific Ocean and in the Bering, Okhotsk, Japan, and Eastern seas from April to December 1906. Proc. U.S. Natl. Mus. 38:25-74.
Couch, L. K. 1929. Introduced European rabbits in the San Juan Islands, Washington. J. Mammal. 10:334-336.