海量图书期刊资源,随时随地畅享阅读乐趣
Lung cancer in relation to airborne radiation levelsKnud J. Helsing; Pearl Van Natta; George W. Comstock; Heidi Kalin; Elsbeth Chee · 1992
Respiratory effects of household exposures to tobacco smoke and gas cooking on nonsmokersKnud J. Helsing; George W. Comstock; Mary B. Meyer; Melvin L. Tockman · 1982