http://tobaccodocuments.org/ahf/1000122111-2125.html
AHF, American Health Foundation; MAX Von Pettenkofer Institut; Adams, J.D.; Hoffmann, D.; Ruhl, C. "Chemical Studies on Tobacco Smoke Lxvi. Assessment of Volatile and Tobacco-Specific N-Nitrosamines in the Smoke of Some Selected West German Cigarettes". 1979 (est.). Bates: 1000122111-2125.
http://tobaccodocuments.org/ahf/1000122111-2125.html