http://tobaccodocuments.org/bat_cdc/24954.html
WILKES EB. "Some Further Analysis of an Experiment to Compare the Tumour - Promoting Activities of the Condensates From Cigarettes B9 - 1 and B9 - 6". 24 Aug 1976. Bates: 105497385-100000093.
http://tobaccodocuments.org/bat_cdc/24954.html