http://tobaccodocuments.org/ctr/HT0112270-9270.html
Hoyt, W.T., Ctr; Forrester, R.B., Mai. "Re Contract 25-C [Approval for Extension of Contract Human Ahh Studies Between Ctr and Mai.]". 19780101/R. Bates: HT0112270-HT0119270.
http://tobaccodocuments.org/ctr/HT0112270-9270.html