%0 Journal Article %T Discovery of the thallium, lead, bismuth, and polonium isotopes %A C. Fry %A M. Thoennessen %J Physics %D 2012 %I arXiv %R 10.1016/j.adt.2012.01.005 %X Currently, forty-two thallium, forty-two lead, forty-one bismuth, and forty-two polonium isotopes have so far been observed; the discovery of these isotopes is discussed. For each isotope a brief summary of the first refereed publication, including the production and identification method, is presented. %U http://arxiv.org/abs/1201.4474v1