<Li> Jump up ^ Robert S. Gottfried, The Black Death: natural and human disaster in medieval Europe (Simon & Schuster, 1983), pp. 126--28 . </Li> <Li> Jump up ^ Byfield, p. 37 </Li> <Li> Jump up ^ Robert S. Gottfried, The Black Death: natural and human disaster in medieval Europe (Simon & Schuster, 1983), p. 126 . </Li> <Li> Jump up ^ Hogue, p. 1844 </Li>

Who were the plague doctors and why did they wear masks