RT Journal Article SR Electronic T1 Changes in the focus of cigarette advertisements in the 1950s JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP 111 OP 112 DO 10.1136/tc.8.1.111 VO 8 IS 1 A1 TRACY L SWEDROCK A1 ANDREW HYLAND A1 JANICE L HASTRUP YR 1999 UL http://tobaccocontrol.bmj.com/content/8/1/111.abstract AB