Page 6 REFERENCES “Project Crested Ice", USAF Nuclear Safety, Volume 65 (Part 2) Special Edition, Jan/Feb/Mar 1970. Aarkrog, A, “Environmental Behavior of Plutonium Accidentally Released at Thule, Greenland”, Health Physics, Volume 32, No. 4, April 1977. Aarkrog, A, et al., “Radioecological Investigations of an Environmental Contamination with Transuranic Elements”, 1980 Progress Report, Radiation Protection, Commission of European Communities.