http://tobaccodocuments.org/ftc_rjr/CX000040.html
"Letter to Jerry L. Clawson (RJR) from Regina E. Simak (William Esty) Re: Preliminary Cigarette Findings from the April 1971 Screening". 02 Jul 1971. Bates: 506052583-506052584.
http://tobaccodocuments.org/ftc_rjr/CX000040.html